666637704 has 48 divisors (see below), whose sum is σ = 1883980800. Its totient is φ = 212550624.

The previous prime is 666637693. The next prime is 666637717. The reversal of 666637704 is 407736666.

It is a self number, because there is not a number n which added to its sum of digits gives 666637704.

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, 199624 + ... + 202935.

It is an arithmetic number, because the mean of its divisors is an integer number (39249600).

Almost surely, 2^666637704 is an apocalyptic number.

It is an amenable number.

666637704 is an abundant number, since it is smaller than the sum of its proper divisors (1217343096).

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

666637704 is a wasteful number, since it uses less digits than its factorization.

666637704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402594 (or 402587 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 45.

The square root of 666637704 is about 25819.3281089962. The cubic root of 666637704 is about 873.5678139432.

The spelling of 666637704 in words is "six hundred sixty-six million, six hundred thirty-seven thousand, seven hundred four".