165566516 has 12 divisors (see below), whose sum is σ = 289921632. Its totient is φ = 82731768.

The previous prime is 165566509. The next prime is 165566543. The reversal of 165566516 is 615665561.

165566516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 5120 + ... + 18903.

It is an arithmetic number, because the mean of its divisors is an integer number (24160136).

Almost surely, 2^165566516 is an apocalyptic number.

It is an amenable number.

165566516 is a deficient number, since it is larger than the sum of its proper divisors (124355116).

165566516 is a wasteful number, since it uses less digits than its factorization.

165566516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25750 (or 25748 counting only the distinct ones).

The product of its digits is 162000, while the sum is 41.

The square root of 165566516 is about 12867.2652883198. The cubic root of 165566516 is about 549.1076615631.

It can be divided in two parts, 165566 and 516, that multiplied together give a triangular number (85432056 = T₁₃₀₇₁).

The spelling of 165566516 in words is "one hundred sixty-five million, five hundred sixty-six thousand, five hundred sixteen".