Factors of 999,999,999,999. Calculator of Proper, Improper, Prime and Compound Divisors, if Any

All the factors (divisors) of the number 999,999,999,999. Connection with the prime factorization of the number

To find all the divisors of the number 999,999,999,999:

  • 1. Decompose the number into prime factors.
  • See how you can find out how many factors (divisors) the number has, without actually calculating them.
  • 2. Multiply the prime factors in all their unique combinations, that yield different results.

1. Carry out the prime factorization of the number 999,999,999,999:

The prime factorization of a number: finding the prime numbers that multiply together to make that number.


999,999,999,999 = 33 × 7 × 11 × 13 × 37 × 101 × 9,901
999,999,999,999 is not a prime number but a composite one.


  • Prime number: a natural number that is divisible (divided evenly) only by 1 and itself. A prime number has exactly two factors: 1 and the number itself.
  • Examples of prime numbers: 2 (factors 1, 2), 3 (factors 1, 3), 5 (factors 1, 5), 7 (factors 1, 7), 11 (factors 1, 11), 13 (factors 1, 13), ...
  • Composite number: a natural number that has at least one factor other than 1 and itself. So it is neither a prime number nor 1.
  • Examples of composite numbers: 4 (it has 3 factors: 1, 2, 4), 6 (it has 4 factors: 1, 2, 3, 6), 8 (it has 4 factors: 1, 2, 4, 8), 9 (it has 3 factors: 1, 3, 9), 10 (it has 4 factors: 1, 2, 5, 10), 12 (it has 6 factors: 1, 2, 3, 4, 6, 12), ...

  • » Online calculator. Check whether a number is prime or not. The prime factorization of composite numbers (decomposition into prime factors)


How to count the number of factors of a number?

Without actually finding the factors

  • If a number N is prime factorized as:
    N = am × bk × cz
    where a, b, c are the prime factors and m, k, z are their exponents, natural numbers, ....
  • ...
  • Then the number of factors of the number N can be calculated as:
    n = (m + 1) × (k + 1) × (z + 1)
  • ...
  • In our case, the number of factors is calculated as:
  • n = (3 + 1) × (1 + 1) × (1 + 1) × (1 + 1) × (1 + 1) × (1 + 1) × (1 + 1) = 4 × 2 × 2 × 2 × 2 × 2 × 2 = 256

But to actually calculate the factors, see below...

2. Multiply the prime factors of the number 999,999,999,999

  • Multiply the prime factors involved in the prime factorization of the number in all their unique combinations, that give different results.
  • Also consider the exponents of these prime factors.
  • Also add 1 to the list of factors (divisors). All the numbers are divisible by 1.

All the factors (divisors) are listed below - in ascending order

The list of factors (divisors):

Numbers other than 1 that are not prime factors are composite factors (divisors).

neither prime nor composite = 1
prime factor = 3
prime factor = 7
composite factor = 32 = 9
prime factor = 11
prime factor = 13
composite factor = 3 × 7 = 21
composite factor = 33 = 27
composite factor = 3 × 11 = 33
prime factor = 37
composite factor = 3 × 13 = 39
composite factor = 32 × 7 = 63
composite factor = 7 × 11 = 77
composite factor = 7 × 13 = 91
composite factor = 32 × 11 = 99
prime factor = 101
composite factor = 3 × 37 = 111
composite factor = 32 × 13 = 117
composite factor = 11 × 13 = 143
composite factor = 33 × 7 = 189
composite factor = 3 × 7 × 11 = 231
composite factor = 7 × 37 = 259
composite factor = 3 × 7 × 13 = 273
composite factor = 33 × 11 = 297
composite factor = 3 × 101 = 303
composite factor = 32 × 37 = 333
composite factor = 33 × 13 = 351
composite factor = 11 × 37 = 407
composite factor = 3 × 11 × 13 = 429
composite factor = 13 × 37 = 481
composite factor = 32 × 7 × 11 = 693
composite factor = 7 × 101 = 707
composite factor = 3 × 7 × 37 = 777
composite factor = 32 × 7 × 13 = 819
composite factor = 32 × 101 = 909
composite factor = 33 × 37 = 999
composite factor = 7 × 11 × 13 = 1,001
composite factor = 11 × 101 = 1,111
composite factor = 3 × 11 × 37 = 1,221
composite factor = 32 × 11 × 13 = 1,287
composite factor = 13 × 101 = 1,313
composite factor = 3 × 13 × 37 = 1,443
composite factor = 33 × 7 × 11 = 2,079
composite factor = 3 × 7 × 101 = 2,121
composite factor = 32 × 7 × 37 = 2,331
composite factor = 33 × 7 × 13 = 2,457
composite factor = 33 × 101 = 2,727
composite factor = 7 × 11 × 37 = 2,849
composite factor = 3 × 7 × 11 × 13 = 3,003
composite factor = 3 × 11 × 101 = 3,333
composite factor = 7 × 13 × 37 = 3,367
composite factor = 32 × 11 × 37 = 3,663
composite factor = 37 × 101 = 3,737
composite factor = 33 × 11 × 13 = 3,861
composite factor = 3 × 13 × 101 = 3,939
composite factor = 32 × 13 × 37 = 4,329
composite factor = 11 × 13 × 37 = 5,291
composite factor = 32 × 7 × 101 = 6,363
composite factor = 33 × 7 × 37 = 6,993
composite factor = 7 × 11 × 101 = 7,777
composite factor = 3 × 7 × 11 × 37 = 8,547
composite factor = 32 × 7 × 11 × 13 = 9,009
composite factor = 7 × 13 × 101 = 9,191
prime factor = 9,901
composite factor = 32 × 11 × 101 = 9,999
composite factor = 3 × 7 × 13 × 37 = 10,101
composite factor = 33 × 11 × 37 = 10,989
composite factor = 3 × 37 × 101 = 11,211
composite factor = 32 × 13 × 101 = 11,817
composite factor = 33 × 13 × 37 = 12,987
composite factor = 11 × 13 × 101 = 14,443
composite factor = 3 × 11 × 13 × 37 = 15,873
composite factor = 33 × 7 × 101 = 19,089
composite factor = 3 × 7 × 11 × 101 = 23,331
composite factor = 32 × 7 × 11 × 37 = 25,641
composite factor = 7 × 37 × 101 = 26,159
composite factor = 33 × 7 × 11 × 13 = 27,027
composite factor = 3 × 7 × 13 × 101 = 27,573
composite factor = 3 × 9,901 = 29,703
composite factor = 33 × 11 × 101 = 29,997
composite factor = 32 × 7 × 13 × 37 = 30,303
composite factor = 32 × 37 × 101 = 33,633
composite factor = 33 × 13 × 101 = 35,451
composite factor = 7 × 11 × 13 × 37 = 37,037
composite factor = 11 × 37 × 101 = 41,107
composite factor = 3 × 11 × 13 × 101 = 43,329
composite factor = 32 × 11 × 13 × 37 = 47,619
composite factor = 13 × 37 × 101 = 48,581
composite factor = 7 × 9,901 = 69,307
composite factor = 32 × 7 × 11 × 101 = 69,993
composite factor = 33 × 7 × 11 × 37 = 76,923
composite factor = 3 × 7 × 37 × 101 = 78,477
composite factor = 32 × 7 × 13 × 101 = 82,719
composite factor = 32 × 9,901 = 89,109
composite factor = 33 × 7 × 13 × 37 = 90,909
composite factor = 33 × 37 × 101 = 100,899
composite factor = 7 × 11 × 13 × 101 = 101,101
composite factor = 11 × 9,901 = 108,911
composite factor = 3 × 7 × 11 × 13 × 37 = 111,111
composite factor = 3 × 11 × 37 × 101 = 123,321
composite factor = 13 × 9,901 = 128,713
composite factor = 32 × 11 × 13 × 101 = 129,987
composite factor = 33 × 11 × 13 × 37 = 142,857
composite factor = 3 × 13 × 37 × 101 = 145,743
composite factor = 3 × 7 × 9,901 = 207,921
composite factor = 33 × 7 × 11 × 101 = 209,979
composite factor = 32 × 7 × 37 × 101 = 235,431
composite factor = 33 × 7 × 13 × 101 = 248,157
composite factor = 33 × 9,901 = 267,327
composite factor = 7 × 11 × 37 × 101 = 287,749
composite factor = 3 × 7 × 11 × 13 × 101 = 303,303
composite factor = 3 × 11 × 9,901 = 326,733
composite factor = 32 × 7 × 11 × 13 × 37 = 333,333
composite factor = 7 × 13 × 37 × 101 = 340,067
composite factor = 37 × 9,901 = 366,337
composite factor = 32 × 11 × 37 × 101 = 369,963
composite factor = 3 × 13 × 9,901 = 386,139
composite factor = 33 × 11 × 13 × 101 = 389,961
composite factor = 32 × 13 × 37 × 101 = 437,229
composite factor = 11 × 13 × 37 × 101 = 534,391
composite factor = 32 × 7 × 9,901 = 623,763
composite factor = 33 × 7 × 37 × 101 = 706,293
composite factor = 7 × 11 × 9,901 = 762,377
composite factor = 3 × 7 × 11 × 37 × 101 = 863,247
composite factor = 7 × 13 × 9,901 = 900,991
composite factor = 32 × 7 × 11 × 13 × 101 = 909,909
composite factor = 32 × 11 × 9,901 = 980,199
composite factor = 33 × 7 × 11 × 13 × 37 = 999,999
This list continues below...

... This list continues from above
composite factor = 101 × 9,901 = 1,000,001
composite factor = 3 × 7 × 13 × 37 × 101 = 1,020,201
composite factor = 3 × 37 × 9,901 = 1,099,011
composite factor = 33 × 11 × 37 × 101 = 1,109,889
composite factor = 32 × 13 × 9,901 = 1,158,417
composite factor = 33 × 13 × 37 × 101 = 1,311,687
composite factor = 11 × 13 × 9,901 = 1,415,843
composite factor = 3 × 11 × 13 × 37 × 101 = 1,603,173
composite factor = 33 × 7 × 9,901 = 1,871,289
composite factor = 3 × 7 × 11 × 9,901 = 2,287,131
composite factor = 7 × 37 × 9,901 = 2,564,359
composite factor = 32 × 7 × 11 × 37 × 101 = 2,589,741
composite factor = 3 × 7 × 13 × 9,901 = 2,702,973
composite factor = 33 × 7 × 11 × 13 × 101 = 2,729,727
composite factor = 33 × 11 × 9,901 = 2,940,597
composite factor = 3 × 101 × 9,901 = 3,000,003
composite factor = 32 × 7 × 13 × 37 × 101 = 3,060,603
composite factor = 32 × 37 × 9,901 = 3,297,033
composite factor = 33 × 13 × 9,901 = 3,475,251
composite factor = 7 × 11 × 13 × 37 × 101 = 3,740,737
composite factor = 11 × 37 × 9,901 = 4,029,707
composite factor = 3 × 11 × 13 × 9,901 = 4,247,529
composite factor = 13 × 37 × 9,901 = 4,762,381
composite factor = 32 × 11 × 13 × 37 × 101 = 4,809,519
composite factor = 32 × 7 × 11 × 9,901 = 6,861,393
composite factor = 7 × 101 × 9,901 = 7,000,007
composite factor = 3 × 7 × 37 × 9,901 = 7,693,077
composite factor = 33 × 7 × 11 × 37 × 101 = 7,769,223
composite factor = 32 × 7 × 13 × 9,901 = 8,108,919
composite factor = 32 × 101 × 9,901 = 9,000,009
composite factor = 33 × 7 × 13 × 37 × 101 = 9,181,809
composite factor = 33 × 37 × 9,901 = 9,891,099
composite factor = 7 × 11 × 13 × 9,901 = 9,910,901
composite factor = 11 × 101 × 9,901 = 11,000,011
composite factor = 3 × 7 × 11 × 13 × 37 × 101 = 11,222,211
composite factor = 3 × 11 × 37 × 9,901 = 12,089,121
composite factor = 32 × 11 × 13 × 9,901 = 12,742,587
composite factor = 13 × 101 × 9,901 = 13,000,013
composite factor = 3 × 13 × 37 × 9,901 = 14,287,143
composite factor = 33 × 11 × 13 × 37 × 101 = 14,428,557
composite factor = 33 × 7 × 11 × 9,901 = 20,584,179
composite factor = 3 × 7 × 101 × 9,901 = 21,000,021
composite factor = 32 × 7 × 37 × 9,901 = 23,079,231
composite factor = 33 × 7 × 13 × 9,901 = 24,326,757
composite factor = 33 × 101 × 9,901 = 27,000,027
composite factor = 7 × 11 × 37 × 9,901 = 28,207,949
composite factor = 3 × 7 × 11 × 13 × 9,901 = 29,732,703
composite factor = 3 × 11 × 101 × 9,901 = 33,000,033
composite factor = 7 × 13 × 37 × 9,901 = 33,336,667
composite factor = 32 × 7 × 11 × 13 × 37 × 101 = 33,666,633
composite factor = 32 × 11 × 37 × 9,901 = 36,267,363
composite factor = 37 × 101 × 9,901 = 37,000,037
composite factor = 33 × 11 × 13 × 9,901 = 38,227,761
composite factor = 3 × 13 × 101 × 9,901 = 39,000,039
composite factor = 32 × 13 × 37 × 9,901 = 42,861,429
composite factor = 11 × 13 × 37 × 9,901 = 52,386,191
composite factor = 32 × 7 × 101 × 9,901 = 63,000,063
composite factor = 33 × 7 × 37 × 9,901 = 69,237,693
composite factor = 7 × 11 × 101 × 9,901 = 77,000,077
composite factor = 3 × 7 × 11 × 37 × 9,901 = 84,623,847
composite factor = 32 × 7 × 11 × 13 × 9,901 = 89,198,109
composite factor = 7 × 13 × 101 × 9,901 = 91,000,091
composite factor = 32 × 11 × 101 × 9,901 = 99,000,099
composite factor = 3 × 7 × 13 × 37 × 9,901 = 100,010,001
composite factor = 33 × 7 × 11 × 13 × 37 × 101 = 100,999,899
composite factor = 33 × 11 × 37 × 9,901 = 108,802,089
composite factor = 3 × 37 × 101 × 9,901 = 111,000,111
composite factor = 32 × 13 × 101 × 9,901 = 117,000,117
composite factor = 33 × 13 × 37 × 9,901 = 128,584,287
composite factor = 11 × 13 × 101 × 9,901 = 143,000,143
composite factor = 3 × 11 × 13 × 37 × 9,901 = 157,158,573
composite factor = 33 × 7 × 101 × 9,901 = 189,000,189
composite factor = 3 × 7 × 11 × 101 × 9,901 = 231,000,231
composite factor = 32 × 7 × 11 × 37 × 9,901 = 253,871,541
composite factor = 7 × 37 × 101 × 9,901 = 259,000,259
composite factor = 33 × 7 × 11 × 13 × 9,901 = 267,594,327
composite factor = 3 × 7 × 13 × 101 × 9,901 = 273,000,273
composite factor = 33 × 11 × 101 × 9,901 = 297,000,297
composite factor = 32 × 7 × 13 × 37 × 9,901 = 300,030,003
composite factor = 32 × 37 × 101 × 9,901 = 333,000,333
composite factor = 33 × 13 × 101 × 9,901 = 351,000,351
composite factor = 7 × 11 × 13 × 37 × 9,901 = 366,703,337
composite factor = 11 × 37 × 101 × 9,901 = 407,000,407
composite factor = 3 × 11 × 13 × 101 × 9,901 = 429,000,429
composite factor = 32 × 11 × 13 × 37 × 9,901 = 471,475,719
composite factor = 13 × 37 × 101 × 9,901 = 481,000,481
composite factor = 32 × 7 × 11 × 101 × 9,901 = 693,000,693
composite factor = 33 × 7 × 11 × 37 × 9,901 = 761,614,623
composite factor = 3 × 7 × 37 × 101 × 9,901 = 777,000,777
composite factor = 32 × 7 × 13 × 101 × 9,901 = 819,000,819
composite factor = 33 × 7 × 13 × 37 × 9,901 = 900,090,009
composite factor = 33 × 37 × 101 × 9,901 = 999,000,999
composite factor = 7 × 11 × 13 × 101 × 9,901 = 1,001,001,001
composite factor = 3 × 7 × 11 × 13 × 37 × 9,901 = 1,100,110,011
composite factor = 3 × 11 × 37 × 101 × 9,901 = 1,221,001,221
composite factor = 32 × 11 × 13 × 101 × 9,901 = 1,287,001,287
composite factor = 33 × 11 × 13 × 37 × 9,901 = 1,414,427,157
composite factor = 3 × 13 × 37 × 101 × 9,901 = 1,443,001,443
composite factor = 33 × 7 × 11 × 101 × 9,901 = 2,079,002,079
composite factor = 32 × 7 × 37 × 101 × 9,901 = 2,331,002,331
composite factor = 33 × 7 × 13 × 101 × 9,901 = 2,457,002,457
composite factor = 7 × 11 × 37 × 101 × 9,901 = 2,849,002,849
composite factor = 3 × 7 × 11 × 13 × 101 × 9,901 = 3,003,003,003
composite factor = 32 × 7 × 11 × 13 × 37 × 9,901 = 3,300,330,033
composite factor = 7 × 13 × 37 × 101 × 9,901 = 3,367,003,367
composite factor = 32 × 11 × 37 × 101 × 9,901 = 3,663,003,663
composite factor = 33 × 11 × 13 × 101 × 9,901 = 3,861,003,861
composite factor = 32 × 13 × 37 × 101 × 9,901 = 4,329,004,329
composite factor = 11 × 13 × 37 × 101 × 9,901 = 5,291,005,291
composite factor = 33 × 7 × 37 × 101 × 9,901 = 6,993,006,993
composite factor = 3 × 7 × 11 × 37 × 101 × 9,901 = 8,547,008,547
composite factor = 32 × 7 × 11 × 13 × 101 × 9,901 = 9,009,009,009
composite factor = 33 × 7 × 11 × 13 × 37 × 9,901 = 9,900,990,099
composite factor = 3 × 7 × 13 × 37 × 101 × 9,901 = 10,101,010,101
composite factor = 33 × 11 × 37 × 101 × 9,901 = 10,989,010,989
composite factor = 33 × 13 × 37 × 101 × 9,901 = 12,987,012,987
composite factor = 3 × 11 × 13 × 37 × 101 × 9,901 = 15,873,015,873
composite factor = 32 × 7 × 11 × 37 × 101 × 9,901 = 25,641,025,641
composite factor = 33 × 7 × 11 × 13 × 101 × 9,901 = 27,027,027,027
composite factor = 32 × 7 × 13 × 37 × 101 × 9,901 = 30,303,030,303
composite factor = 7 × 11 × 13 × 37 × 101 × 9,901 = 37,037,037,037
composite factor = 32 × 11 × 13 × 37 × 101 × 9,901 = 47,619,047,619
composite factor = 33 × 7 × 11 × 37 × 101 × 9,901 = 76,923,076,923
composite factor = 33 × 7 × 13 × 37 × 101 × 9,901 = 90,909,090,909
composite factor = 3 × 7 × 11 × 13 × 37 × 101 × 9,901 = 111,111,111,111
composite factor = 33 × 11 × 13 × 37 × 101 × 9,901 = 142,857,142,857
composite factor = 32 × 7 × 11 × 13 × 37 × 101 × 9,901 = 333,333,333,333
composite factor = 33 × 7 × 11 × 13 × 37 × 101 × 9,901 = 999,999,999,999
256 factors (divisors)

What times what is 999,999,999,999?
What number multiplied by what number equals 999,999,999,999?

All the combinations of any two natural numbers whose product equals 999,999,999,999.

1 × 999,999,999,999 = 999,999,999,999
3 × 333,333,333,333 = 999,999,999,999
7 × 142,857,142,857 = 999,999,999,999
9 × 111,111,111,111 = 999,999,999,999
11 × 90,909,090,909 = 999,999,999,999
13 × 76,923,076,923 = 999,999,999,999
21 × 47,619,047,619 = 999,999,999,999
27 × 37,037,037,037 = 999,999,999,999
33 × 30,303,030,303 = 999,999,999,999
37 × 27,027,027,027 = 999,999,999,999
39 × 25,641,025,641 = 999,999,999,999
63 × 15,873,015,873 = 999,999,999,999
77 × 12,987,012,987 = 999,999,999,999
91 × 10,989,010,989 = 999,999,999,999
99 × 10,101,010,101 = 999,999,999,999
101 × 9,900,990,099 = 999,999,999,999
111 × 9,009,009,009 = 999,999,999,999
117 × 8,547,008,547 = 999,999,999,999
143 × 6,993,006,993 = 999,999,999,999
189 × 5,291,005,291 = 999,999,999,999
231 × 4,329,004,329 = 999,999,999,999
259 × 3,861,003,861 = 999,999,999,999
273 × 3,663,003,663 = 999,999,999,999
297 × 3,367,003,367 = 999,999,999,999
303 × 3,300,330,033 = 999,999,999,999
333 × 3,003,003,003 = 999,999,999,999
351 × 2,849,002,849 = 999,999,999,999
407 × 2,457,002,457 = 999,999,999,999
429 × 2,331,002,331 = 999,999,999,999
481 × 2,079,002,079 = 999,999,999,999
693 × 1,443,001,443 = 999,999,999,999
707 × 1,414,427,157 = 999,999,999,999
777 × 1,287,001,287 = 999,999,999,999
819 × 1,221,001,221 = 999,999,999,999
909 × 1,100,110,011 = 999,999,999,999
999 × 1,001,001,001 = 999,999,999,999
1,001 × 999,000,999 = 999,999,999,999
1,111 × 900,090,009 = 999,999,999,999
1,221 × 819,000,819 = 999,999,999,999
1,287 × 777,000,777 = 999,999,999,999
1,313 × 761,614,623 = 999,999,999,999
1,443 × 693,000,693 = 999,999,999,999
2,079 × 481,000,481 = 999,999,999,999
2,121 × 471,475,719 = 999,999,999,999
2,331 × 429,000,429 = 999,999,999,999
2,457 × 407,000,407 = 999,999,999,999
2,727 × 366,703,337 = 999,999,999,999
2,849 × 351,000,351 = 999,999,999,999
3,003 × 333,000,333 = 999,999,999,999
3,333 × 300,030,003 = 999,999,999,999
3,367 × 297,000,297 = 999,999,999,999
3,663 × 273,000,273 = 999,999,999,999
3,737 × 267,594,327 = 999,999,999,999
3,861 × 259,000,259 = 999,999,999,999
3,939 × 253,871,541 = 999,999,999,999
4,329 × 231,000,231 = 999,999,999,999
5,291 × 189,000,189 = 999,999,999,999
6,363 × 157,158,573 = 999,999,999,999
6,993 × 143,000,143 = 999,999,999,999
7,777 × 128,584,287 = 999,999,999,999
8,547 × 117,000,117 = 999,999,999,999
9,009 × 111,000,111 = 999,999,999,999
9,191 × 108,802,089 = 999,999,999,999
9,901 × 100,999,899 = 999,999,999,999
9,999 × 100,010,001 = 999,999,999,999
10,101 × 99,000,099 = 999,999,999,999
10,989 × 91,000,091 = 999,999,999,999
11,211 × 89,198,109 = 999,999,999,999
11,817 × 84,623,847 = 999,999,999,999
12,987 × 77,000,077 = 999,999,999,999
14,443 × 69,237,693 = 999,999,999,999
15,873 × 63,000,063 = 999,999,999,999
19,089 × 52,386,191 = 999,999,999,999
23,331 × 42,861,429 = 999,999,999,999
25,641 × 39,000,039 = 999,999,999,999
26,159 × 38,227,761 = 999,999,999,999
27,027 × 37,000,037 = 999,999,999,999
27,573 × 36,267,363 = 999,999,999,999
29,703 × 33,666,633 = 999,999,999,999
29,997 × 33,336,667 = 999,999,999,999
30,303 × 33,000,033 = 999,999,999,999
33,633 × 29,732,703 = 999,999,999,999
35,451 × 28,207,949 = 999,999,999,999
37,037 × 27,000,027 = 999,999,999,999
41,107 × 24,326,757 = 999,999,999,999
43,329 × 23,079,231 = 999,999,999,999
47,619 × 21,000,021 = 999,999,999,999
48,581 × 20,584,179 = 999,999,999,999
69,307 × 14,428,557 = 999,999,999,999
69,993 × 14,287,143 = 999,999,999,999
76,923 × 13,000,013 = 999,999,999,999
78,477 × 12,742,587 = 999,999,999,999
82,719 × 12,089,121 = 999,999,999,999
89,109 × 11,222,211 = 999,999,999,999
90,909 × 11,000,011 = 999,999,999,999
100,899 × 9,910,901 = 999,999,999,999
101,101 × 9,891,099 = 999,999,999,999
108,911 × 9,181,809 = 999,999,999,999
111,111 × 9,000,009 = 999,999,999,999
123,321 × 8,108,919 = 999,999,999,999
128,713 × 7,769,223 = 999,999,999,999
129,987 × 7,693,077 = 999,999,999,999
142,857 × 7,000,007 = 999,999,999,999
145,743 × 6,861,393 = 999,999,999,999
207,921 × 4,809,519 = 999,999,999,999
209,979 × 4,762,381 = 999,999,999,999
235,431 × 4,247,529 = 999,999,999,999
248,157 × 4,029,707 = 999,999,999,999
267,327 × 3,740,737 = 999,999,999,999
287,749 × 3,475,251 = 999,999,999,999
303,303 × 3,297,033 = 999,999,999,999
326,733 × 3,060,603 = 999,999,999,999
333,333 × 3,000,003 = 999,999,999,999
340,067 × 2,940,597 = 999,999,999,999
366,337 × 2,729,727 = 999,999,999,999
369,963 × 2,702,973 = 999,999,999,999
386,139 × 2,589,741 = 999,999,999,999
389,961 × 2,564,359 = 999,999,999,999
437,229 × 2,287,131 = 999,999,999,999
534,391 × 1,871,289 = 999,999,999,999
623,763 × 1,603,173 = 999,999,999,999
706,293 × 1,415,843 = 999,999,999,999
762,377 × 1,311,687 = 999,999,999,999
863,247 × 1,158,417 = 999,999,999,999
900,991 × 1,109,889 = 999,999,999,999
909,909 × 1,099,011 = 999,999,999,999
980,199 × 1,020,201 = 999,999,999,999
999,999 × 1,000,001 = 999,999,999,999
128 unique multiplications

The final answer:
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999,999,999,999 has 256 factors (divisors):
1; 3; 7; 9; 11; 13; 21; 27; 33; 37; 39; 63; 77; 91; 99; 101; 111; 117; 143; 189; 231; 259; 273; 297; 303; 333; 351; 407; 429; 481; 693; 707; 777; 819; 909; 999; 1,001; 1,111; 1,221; 1,287; 1,313; 1,443; 2,079; 2,121; 2,331; 2,457; 2,727; 2,849; 3,003; 3,333; 3,367; 3,663; 3,737; 3,861; 3,939; 4,329; 5,291; 6,363; 6,993; 7,777; 8,547; 9,009; 9,191; 9,901; 9,999; 10,101; 10,989; 11,211; 11,817; 12,987; 14,443; 15,873; 19,089; 23,331; 25,641; 26,159; 27,027; 27,573; 29,703; 29,997; 30,303; 33,633; 35,451; 37,037; 41,107; 43,329; 47,619; 48,581; 69,307; 69,993; 76,923; 78,477; 82,719; 89,109; 90,909; 100,899; 101,101; 108,911; 111,111; 123,321; 128,713; 129,987; 142,857; 145,743; 207,921; 209,979; 235,431; 248,157; 267,327; 287,749; 303,303; 326,733; 333,333; 340,067; 366,337; 369,963; 386,139; 389,961; 437,229; 534,391; 623,763; 706,293; 762,377; 863,247; 900,991; 909,909; 980,199; 999,999; 1,000,001; 1,020,201; 1,099,011; 1,109,889; 1,158,417; 1,311,687; 1,415,843; 1,603,173; 1,871,289; 2,287,131; 2,564,359; 2,589,741; 2,702,973; 2,729,727; 2,940,597; 3,000,003; 3,060,603; 3,297,033; 3,475,251; 3,740,737; 4,029,707; 4,247,529; 4,762,381; 4,809,519; 6,861,393; 7,000,007; 7,693,077; 7,769,223; 8,108,919; 9,000,009; 9,181,809; 9,891,099; 9,910,901; 11,000,011; 11,222,211; 12,089,121; 12,742,587; 13,000,013; 14,287,143; 14,428,557; 20,584,179; 21,000,021; 23,079,231; 24,326,757; 27,000,027; 28,207,949; 29,732,703; 33,000,033; 33,336,667; 33,666,633; 36,267,363; 37,000,037; 38,227,761; 39,000,039; 42,861,429; 52,386,191; 63,000,063; 69,237,693; 77,000,077; 84,623,847; 89,198,109; 91,000,091; 99,000,099; 100,010,001; 100,999,899; 108,802,089; 111,000,111; 117,000,117; 128,584,287; 143,000,143; 157,158,573; 189,000,189; 231,000,231; 253,871,541; 259,000,259; 267,594,327; 273,000,273; 297,000,297; 300,030,003; 333,000,333; 351,000,351; 366,703,337; 407,000,407; 429,000,429; 471,475,719; 481,000,481; 693,000,693; 761,614,623; 777,000,777; 819,000,819; 900,090,009; 999,000,999; 1,001,001,001; 1,100,110,011; 1,221,001,221; 1,287,001,287; 1,414,427,157; 1,443,001,443; 2,079,002,079; 2,331,002,331; 2,457,002,457; 2,849,002,849; 3,003,003,003; 3,300,330,033; 3,367,003,367; 3,663,003,663; 3,861,003,861; 4,329,004,329; 5,291,005,291; 6,993,006,993; 8,547,008,547; 9,009,009,009; 9,900,990,099; 10,101,010,101; 10,989,010,989; 12,987,012,987; 15,873,015,873; 25,641,025,641; 27,027,027,027; 30,303,030,303; 37,037,037,037; 47,619,047,619; 76,923,076,923; 90,909,090,909; 111,111,111,111; 142,857,142,857; 333,333,333,333 and 999,999,999,999
out of which 7 prime factors: 3; 7; 11; 13; 37; 101 and 9,901.
Numbers other than 1 that are not prime factors are composite factors (divisors).
999,999,999,999 and 1 are sometimes called improper factors, the others are called proper factors (proper divisors).

  • A quick way to find the factors (the divisors) of a number is to break it down into prime factors.
  • Then multiply the prime factors and their exponents, if any, in all their different combinations.

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Factors (divisors), common factors (common divisors), the greatest common factor, GCF (also called the greatest common divisor, GCD, or the highest common factor, HCF)

  • If the number "t" is a factor (divisor) of the number "a" then in the prime factorization of "t" we will only encounter prime factors that also occur in the prime factorization of "a".
  • If there are exponents involved, the maximum value of an exponent for any base of a power that is found in the prime factorization of "t" (powers, or multiplicities) is at most equal to the exponent of the same base that is involved in the prime factorization of "a".
  • Hint: 23 = 2 × 2 × 2 = 8. 2 is called the base and 3 is the exponent. 23 is the power and 8 is the value of the power. We sometimes say that the number 2 is raised to the power of 3.
  • For example, 12 is a factor (divisor) of 120 - the remainder is zero when dividing 120 by 12.
  • Let's look at the prime factorization of both numbers and notice the bases and the exponents that occur in the prime factorization of both numbers:
  • 12 = 2 × 2 × 3 = 22 × 3
  • 120 = 2 × 2 × 2 × 3 × 5 = 23 × 3 × 5
  • 120 contains all the prime factors of 12, and all its bases' exponents are higher than those of 12.
  • If "t" is a common factor (divisor) of "a" and "b", then the prime factorization of "t" contains only the common prime factors involved in the prime factorizations of both "a" and "b".
  • If there are exponents involved, the maximum value of an exponent for any base of a power that is found in the prime factorization of "t" is at most equal to the minimum of the exponents of the same base that is involved in the prime factorization of both "a" and "b".
  • For example, 12 is the common factor of 48 and 360.
  • The remainder is zero when dividing either 48 or 360 by 12.
  • Here there are the prime factorizations of the three numbers, 12, 48 and 360:
  • 12 = 22 × 3
  • 48 = 24 × 3
  • 360 = 23 × 32 × 5
  • Please note that 48 and 360 have more factors (divisors): 2, 3, 4, 6, 8, 12, 24. Among them, 24 is the greatest common factor, GCF (or the greatest common divisor, GCD, or the highest common factor, HCF) of 48 and 360.
  • The greatest common factor, GCF, of two numbers, "a" and "b", is the product of all the common prime factors involved in the prime factorizations of both "a" and "b", taken by the lowest exponents.
  • Based on this rule it is calculated the greatest common factor, GCF, (or the greatest common divisor GCD, HCF) of several numbers, as shown in the example below...
  • GCF, GCD (1,260; 3,024; 5,544) = ?
  • 1,260 = 22 × 32
  • 3,024 = 24 × 32 × 7
  • 5,544 = 23 × 32 × 7 × 11
  • The common prime factors are:
  • 2 - its lowest exponent (multiplicity) is: min.(2; 3; 4) = 2
  • 3 - its lowest exponent (multiplicity) is: min.(2; 2; 2) = 2
  • GCF, GCD (1,260; 3,024; 5,544) = 22 × 32 = 252
  • Coprime numbers:
  • If two numbers "a" and "b" have no other common factors (divisors) than 1, gfc, gcd, hcf (a; b) = 1, then the numbers "a" and "b" are called coprime (or relatively prime).
  • Factors of the GCF
  • If "a" and "b" are not coprime, then every common factor (divisor) of "a" and "b" is a also a factor (divisor) of the greatest common factor, GCF (greatest common divisor, GCD, highest common factor, HCF) of "a" and "b".