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# Problem 3

## Largest prime factor

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

What is the largest prime factor of the number $600851475143$?

## 最大质因数

$13195$的质因数包括$5$、$7$、$13$和$29$。

$600851475143$的最大质因数是多少？