665995056 has 40 divisors (see below), whose sum is σ = 1724626224. Its totient is φ = 221464320.

The previous prime is 665995039. The next prime is 665995067. The reversal of 665995056 is 650599566.

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, 3730 + ... + 36686.

Almost surely, 2^665995056 is an apocalyptic number.

It is an amenable number.

665995056 is an abundant number, since it is smaller than the sum of its proper divisors (1058631168).

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

665995056 is a wasteful number, since it uses less digits than its factorization.

665995056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33389 (or 33383 counting only the distinct ones).

The product of its (nonzero) digits is 2187000, while the sum is 51.

The square root of 665995056 is about 25806.8800128958. The cubic root of 665995056 is about 873.2870131925.

The spelling of 665995056 in words is "six hundred sixty-five million, nine hundred ninety-five thousand, fifty-six".