666456611904 has 168 divisors, whose sum is σ = 2087894435328. Its totient is φ = 202339676160.

The previous prime is 666456611869. The next prime is 666456611927. The reversal of 666456611904 is 409116654666.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 794212 + ... + 1401315.

Almost surely, 2^666456611904 is an apocalyptic number.

666456611904 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

666456611904 is an abundant number, since it is smaller than the sum of its proper divisors (1421437823424).

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

666456611904 is a wasteful number, since it uses less digits than its factorization.

666456611904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195593 (or 2195580 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The spelling of 666456611904 in words is "six hundred sixty-six billion, four hundred fifty-six million, six hundred eleven thousand, nine hundred four".