# Euler Problem 3: Largest prime factor : C Programming Solution

**Problem :**

The prime factors of 13195 are 5, 7, 13 and 29.

What is the largest prime factor of the number 600851475143 ?

**Solution Approach :**

Simple approach would be to identify all the prime numbers under the square root of the number 600851475143 which divide the the number 600851475143. When you find a prime factor using this method, keep the track of largest such number to get our result. Read More…