165665312 has 24 divisors (see below), whose sum is σ = 329823900. Its totient is φ = 81900544.

The previous prime is 165665299. The next prime is 165665327. The reversal of 165665312 is 213566561.

It can be written as a sum of positive squares in 2 ways, for example, as 153859216 + 11806096 = 12404^2 + 3436^2 .

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, 26237 + ... + 31932.

Almost surely, 2^165665312 is an apocalyptic number.

It is an amenable number.

165665312 is a deficient number, since it is larger than the sum of its proper divisors (164158588).

165665312 is an equidigital number, since it uses as much as digits as its factorization.

165665312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58268 (or 58260 counting only the distinct ones).

The product of its digits is 32400, while the sum is 35.

The square root of 165665312 is about 12871.1037599733. The cubic root of 165665312 is about 549.2168600792.

The spelling of 165665312 in words is "one hundred sixty-five million, six hundred sixty-five thousand, three hundred twelve".