Q: What are the prime factors of the number 197,809,664?

 A: 2, 13, 113, 263

Why are those the prime factors of the number 197,809,664?

Prime factors are the prime numbers that can be multipled together to equal the original number. You find the factors by dividing by prime numbers. It is best shown by creating a Factor Tree.

Factor Tree for the number 197,809,664

197,809,664
Factor Arrows
298,904,832
Factor Arrows
249,452,416
Factor Arrows
224,726,208
Factor Arrows
212,363,104
Factor Arrows
26,181,552
Factor Arrows
23,090,776
Factor Arrows
21,545,388
Factor Arrows
2772,694
Factor Arrows
2386,347
Factor Arrows
1329,719
Factor Arrows
113263

The numbers in bold above are the prime factors. If there are multiples, you only count them one time. This leads us to our prime factors of:

2, 13, 113, 263

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 13 x 113 x 263 = 197,809,664

This can also be written as 29 x 131 x 1131 x 2631 = 197,809,664

If you would like to know more, or need additional explanation, please review our prime factorization explanation.


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