666631884 has 24 divisors (see below), whose sum is σ = 1556107840. Its totient is φ = 222120144.

The previous prime is 666631877. The next prime is 666631913. The reversal of 666631884 is 488136666.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

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, 23727 + ... + 43545.

Almost surely, 2^666631884 is an apocalyptic number.

It is an amenable number.

666631884 is an abundant number, since it is smaller than the sum of its proper divisors (889475956).

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

666631884 is a wasteful number, since it uses less digits than its factorization.

666631884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22629 (or 22627 counting only the distinct ones).

The product of its digits is 995328, while the sum is 48.

The square root of 666631884 is about 25819.2154024866. The cubic root of 666631884 is about 873.5652717430.

The spelling of 666631884 in words is "six hundred sixty-six million, six hundred thirty-one thousand, eight hundred eighty-four".