666755904 has 56 divisors (see below), whose sum is σ = 1856983840. Its totient is φ = 210553344.

The previous prime is 666755857. The next prime is 666755941. The reversal of 666755904 is 409557666.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

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, 87739 + ... + 95034.

Almost surely, 2^666755904 is an apocalyptic number.

666755904 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

666755904 is an abundant number, since it is smaller than the sum of its proper divisors (1190227936).

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

666755904 is a wasteful number, since it uses less digits than its factorization.

666755904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182807 (or 182797 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 48.

The square root of 666755904 is about 25821.6169904210. The cubic root of 666755904 is about 873.6194409928.

The spelling of 666755904 in words is "six hundred sixty-six million, seven hundred fifty-five thousand, nine hundred four".