666455403504 has 80 divisors (see below), whose sum is σ = 1904646023424. Its totient is φ = 199111718400.

The previous prime is 666455403379. The next prime is 666455403557. The reversal of 666455403504 is 405304554666.

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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8851429 + ... + 8926404.

Almost surely, 2^666455403504 is an apocalyptic number.

It is an amenable number.

666455403504 is an abundant number, since it is smaller than the sum of its proper divisors (1238190619920).

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

666455403504 is a wasteful number, since it uses less digits than its factorization.

666455403504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17777926 (or 17777920 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 48.

The spelling of 666455403504 in words is "six hundred sixty-six billion, four hundred fifty-five million, four hundred three thousand, five hundred four".