165911916 has 12 divisors (see below), whose sum is σ = 387127832. Its totient is φ = 55303968.

The previous prime is 165911881. The next prime is 165911923. The reversal of 165911916 is 619119561.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6912985 + ... + 6913008.

Almost surely, 2^165911916 is an apocalyptic number.

It is an amenable number.

165911916 is an abundant number, since it is smaller than the sum of its proper divisors (221215916).

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

165911916 is a wasteful number, since it uses less digits than its factorization.

165911916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13826000 (or 13825998 counting only the distinct ones).

The product of its digits is 14580, while the sum is 39.

The square root of 165911916 is about 12880.6799509964. The cubic root of 165911916 is about 549.4892404286.

The spelling of 165911916 in words is "one hundred sixty-five million, nine hundred eleven thousand, nine hundred sixteen".