Factors / Factors of 65

Factors of 65

1, 5, 13, 65

65 breaks into 2 pairs, tested up to √65 ≈ 8.1; each pair multiplies back to 65 exactly. 65's full pair list is (1, 65), (5, 13), for 4 divisors in total. 65's divisors other than 65 itself sum to just 19, 46 below 65: the common deficient case. 65 is odd, digit sum 11 for 65; small divisors of 65 include 5. 65 has 4 divisors; 64 has 7 and 66 has 8, so 66 wins here. 65 divided by its largest divisor, 13, gives 5.