165665264 has 40 divisors (see below), whose sum is σ = 327970080. Its totient is φ = 81043200.

The previous prime is 165665249. The next prime is 165665267. The reversal of 165665264 is 462566561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165665267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262229 + ... + 262859.

It is an arithmetic number, because the mean of its divisors is an integer number (8199252).

Almost surely, 2^165665264 is an apocalyptic number.

It is an amenable number.

165665264 is a deficient number, since it is larger than the sum of its proper divisors (162304816).

165665264 is a wasteful number, since it uses less digits than its factorization.

165665264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969 (or 963 counting only the distinct ones).

The product of its digits is 259200, while the sum is 41.

The square root of 165665264 is about 12871.1018953313. The cubic root of 165665264 is about 549.2168070357.

The spelling of 165665264 in words is "one hundred sixty-five million, six hundred sixty-five thousand, two hundred sixty-four".