Problem 3 - The prime factors of 13195 are 5, 7, 13 and 29.
What is the largest prime factor of the number 600851475143 ?

Factor = 71    $Unfactored = 8462696833
Factor = 839    $Unfactored = 10086647
Factor = 1471    $Unfactored = 6857
Factor = 6857    $Unfactored = 1