165109904 has 10 divisors (see below), whose sum is σ = 319900470. Its totient is φ = 82554944.

The previous prime is 165109891. The next prime is 165109913. The reversal of 165109904 is 409901561.

It can be written as a sum of positive squares in only one way, i.e., 162613504 + 2496400 = 12752^2 + 1580^2 .

It is a super-2 number, since 2×165109904² = 54522560797778432, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5159669 + ... + 5159700.

It is an arithmetic number, because the mean of its divisors is an integer number (31990047).

Almost surely, 2^165109904 is an apocalyptic number.

It is an amenable number.

165109904 is a deficient number, since it is larger than the sum of its proper divisors (154790566).

165109904 is a wasteful number, since it uses less digits than its factorization.

165109904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10319377 (or 10319371 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 165109904 is about 12849.5098739213. The cubic root of 165109904 is about 548.6024064331.

The spelling of 165109904 in words is "one hundred sixty-five million, one hundred nine thousand, nine hundred four".