Factors / Factors of 165

Factors of 165

1, 3, 5, 11, 15, 33, 55, 165

165 breaks into 4 pairs, tested up to √165 ≈ 12.8; each pair multiplies back to 165 exactly. 165's full pair list is (1, 165), (3, 55), (5, 33), (11, 15), for 8 divisors in total. 165's divisors other than 165 itself sum to just 123, 42 below 165: the common deficient case. 165 is odd, digit sum 12 for 165; small divisors of 165 include 3, 5, 11. 165 has 8 divisors; 164 has 6 and 166 has 4, so 165 wins here. 165 divided by its largest divisor, 55, gives 3.