165515564 has 6 divisors (see below), whose sum is σ = 289652244. Its totient is φ = 82757780.

The previous prime is 165515563. The next prime is 165515569. The reversal of 165515564 is 465515561.

It is a happy number.

165515564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (165515561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20689442 + ... + 20689449.

It is an arithmetic number, because the mean of its divisors is an integer number (48275374).

Almost surely, 2^165515564 is an apocalyptic number.

It is an amenable number.

165515564 is a deficient number, since it is larger than the sum of its proper divisors (124136680).

165515564 is a wasteful number, since it uses less digits than its factorization.

165515564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41378895 (or 41378893 counting only the distinct ones).

The product of its digits is 90000, while the sum is 38.

The square root of 165515564 is about 12865.2852280857. The cubic root of 165515564 is about 549.0513277005.

The spelling of 165515564 in words is "one hundred sixty-five million, five hundred fifteen thousand, five hundred sixty-four".