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# The prime factors of 13195 are 5, 7, 13 and 29. What is the largest prime factor of the number 600851475143 ?

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- PuzzlingLv 71 decade agoFavorite Answer
That would take awhile to factor by hand. It's easier to use a program to factor it for you.

Prime factors of 600,851,475,143:

= 71 * 839 * 1,471 * 6,857

Answer:

6,857

P.S. You can try it yourself using the links below

Source(s): http://www.brennen.net/primes/FactorApplet.html http://math-it.org/Mathematik/Zahlentheorie/Zahl/Z... - ShishkaniLv 61 decade ago
Start dividing it up and see.

I'd start with the small primes and see which ones it is divisible by. Then I'd start doing a prime factorization. Each time you divide it evenly by something, put it in the tree and work on the new number.

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