665079816 has 32 divisors (see below), whose sum is σ = 1672320960. Its totient is φ = 220410432.

The previous prime is 665079803. The next prime is 665079851. The reversal of 665079816 is 618970566.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75940 + ... + 84243.

It is an arithmetic number, because the mean of its divisors is an integer number (52260030).

Almost surely, 2^665079816 is an apocalyptic number.

It is an amenable number.

665079816 is an abundant number, since it is smaller than the sum of its proper divisors (1007241144).

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

665079816 is a wasteful number, since it uses less digits than its factorization.

665079816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160365 (or 160361 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 48.

The square root of 665079816 is about 25789.1414358834. The cubic root of 665079816 is about 872.8867931968.

The spelling of 665079816 in words is "six hundred sixty-five million, seventy-nine thousand, eight hundred sixteen".