165500556 has 96 divisors (see below), whose sum is σ = 435976128. Its totient is φ = 48522240.

The previous prime is 165500551. The next prime is 165500557. The reversal of 165500556 is 655005561.

It is not an unprimeable number, because it can be changed into a prime (165500551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 305646 + ... + 306186.

It is an arithmetic number, because the mean of its divisors is an integer number (4541418).

Almost surely, 2^165500556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165500556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217988064).

165500556 is an abundant number, since it is smaller than the sum of its proper divisors (270475572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165500556 is a wasteful number, since it uses less digits than its factorization.

165500556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651 (or 649 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 33.

The square root of 165500556 is about 12864.7019398041. The cubic root of 165500556 is about 549.0347322594.

The spelling of 165500556 in words is "one hundred sixty-five million, five hundred thousand, five hundred fifty-six".