666406715928 has 32 divisors (see below), whose sum is σ = 1667794878960. Its totient is φ = 221898493440.

The previous prime is 666406715881. The next prime is 666406715983. The reversal of 666406715928 is 829517604666.

It is a super-2 number, since 2×666406715928² (a number of 24 digits) contains 22 as substring.

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, 14794453 + ... + 14839428.

Almost surely, 2^666406715928 is an apocalyptic number.

It is an amenable number.

666406715928 is an abundant number, since it is smaller than the sum of its proper divisors (1001388163032).

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

666406715928 is a wasteful number, since it uses less digits than its factorization.

666406715928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29634827 (or 29634823 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 60.

The spelling of 666406715928 in words is "six hundred sixty-six billion, four hundred six million, seven hundred fifteen thousand, nine hundred twenty-eight".