Answers for "he prime factors of 13195 are 5, 7, 13 and 29. What is the largest prime factor of the number 600851475143 ?"

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

def max_factor(num):
    """Find the maximum prime factor."""
    factor = 2
    while factor * factor <= num:
        while num % factor == 0:
            num /= factor
        factor += 1
    if (num > 1):
        return num
    return factor
    
print max_factor(33) #11
print max_factor(38) #19
print max_factor(600851475143) #6857