Q: What are the prime factors of the number 261,205,056?

 A: 2, 3, 7, 64783

Why are those the prime factors of the number 261,205,056?

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 261,205,056

261,205,056
Factor Arrows
2130,602,528
Factor Arrows
265,301,264
Factor Arrows
232,650,632
Factor Arrows
216,325,316
Factor Arrows
28,162,658
Factor Arrows
24,081,329
Factor Arrows
31,360,443
Factor Arrows
3453,481
Factor Arrows
764,783

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, 3, 7, 64783

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 3 x 3 x 7 x 64,783 = 261,205,056

This can also be written as 26 x 32 x 71 x 64,7831 = 261,205,056

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


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