665593992 has 48 divisors (see below), whose sum is σ = 2060173440. Its totient is φ = 190169568.

The previous prime is 665593967. The next prime is 665594023. The reversal of 665593992 is 299395566.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 659808 + ... + 660815.

It is an arithmetic number, because the mean of its divisors is an integer number (42920280).

Almost surely, 2^665593992 is an apocalyptic number.

It is an amenable number.

665593992 is an abundant number, since it is smaller than the sum of its proper divisors (1394579448).

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

665593992 is a wasteful number, since it uses less digits than its factorization.

665593992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320642 (or 1320635 counting only the distinct ones).

The product of its digits is 3936600, while the sum is 54.

The square root of 665593992 is about 25799.1083566855. The cubic root of 665593992 is about 873.1116794023. Note that the first 3 decimals are identical.

The spelling of 665593992 in words is "six hundred sixty-five million, five hundred ninety-three thousand, nine hundred ninety-two".