165172645 has 16 divisors (see below), whose sum is σ = 220309632. Its totient is φ = 117856960.

The previous prime is 165172639. The next prime is 165172703. The reversal of 165172645 is 546271561.

It is a happy number.

165172645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 165172645 - 2²³ = 156784037 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 15 ways as a sum of consecutive naturals, for example, 25417 + ... + 31246.

It is an arithmetic number, because the mean of its divisors is an integer number (13769352).

Almost surely, 2^165172645 is an apocalyptic number.

It is an amenable number.

165172645 is a deficient number, since it is larger than the sum of its proper divisors (55136987).

165172645 is a wasteful number, since it uses less digits than its factorization.

165172645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56732.

The product of its digits is 50400, while the sum is 37.

The square root of 165172645 is about 12851.9510192033. The cubic root of 165172645 is about 548.6718864257.

The spelling of 165172645 in words is "one hundred sixty-five million, one hundred seventy-two thousand, six hundred forty-five".