165538500 has 48 divisors (see below), whose sum is σ = 482052480. Its totient is φ = 44143200.

The previous prime is 165538459. The next prime is 165538511. The reversal of 165538500 is 5835561.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53680 + ... + 56679.

It is an arithmetic number, because the mean of its divisors is an integer number (10042760).

Almost surely, 2^165538500 is an apocalyptic number.

165538500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165538500 is an abundant number, since it is smaller than the sum of its proper divisors (316513980).

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

165538500 is a wasteful number, since it uses less digits than its factorization.

165538500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110381 (or 110369 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 165538500 is about 12866.1765882487. The cubic root of 165538500 is about 549.0766877720.

The spelling of 165538500 in words is "one hundred sixty-five million, five hundred thirty-eight thousand, five hundred".