165897664 has 28 divisors (see below), whose sum is σ = 346532200. Its totient is φ = 78582528.

The previous prime is 165897659. The next prime is 165897701. The reversal of 165897664 is 466798561.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66999 + ... + 69430.

It is an arithmetic number, because the mean of its divisors is an integer number (12376150).

Almost surely, 2^165897664 is an apocalyptic number.

It is an amenable number.

165897664 is an abundant number, since it is smaller than the sum of its proper divisors (180634536).

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

165897664 is a wasteful number, since it uses less digits than its factorization.

165897664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136460 (or 136450 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 52.

The square root of 165897664 is about 12880.1267074513. The cubic root of 165897664 is about 549.4735060857.

The spelling of 165897664 in words is "one hundred sixty-five million, eight hundred ninety-seven thousand, six hundred sixty-four".