165916915975 has 12 divisors (see below), whose sum is σ = 205773139944. Its totient is φ = 132710201120.

The previous prime is 165916915963. The next prime is 165916915987. The reversal of 165916915975 is 579519619561.

It is an interprime number because it is at equal distance from previous prime (165916915963) and next prime (165916915987).

It is not a de Polignac number, because 165916915975 - 2²⁵ = 165883361543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 437509 + ... + 723358.

It is an arithmetic number, because the mean of its divisors is an integer number (17147761662).

Almost surely, 2^165916915975 is an apocalyptic number.

165916915975 is a deficient number, since it is larger than the sum of its proper divisors (39856223969).

165916915975 is a wasteful number, since it uses less digits than its factorization.

165916915975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166594 (or 1166589 counting only the distinct ones).

The product of its digits is 22963500, while the sum is 64.

The spelling of 165916915975 in words is "one hundred sixty-five billion, nine hundred sixteen million, nine hundred fifteen thousand, nine hundred seventy-five".