666700406668 has 24 divisors (see below), whose sum is σ = 1195857667872. Its totient is φ = 325102113024.

The previous prime is 666700406657. The next prime is 666700406681. The reversal of 666700406668 is 866604007666.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct 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, 9380205 + ... + 9451012.

It is an arithmetic number, because the mean of its divisors is an integer number (49827402828).

Almost surely, 2^666700406668 is an apocalyptic number.

It is an amenable number.

666700406668 is a deficient number, since it is larger than the sum of its proper divisors (529157261204).

666700406668 is a wasteful number, since it uses less digits than its factorization.

666700406668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18831441 (or 18831439 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 55.

The spelling of 666700406668 in words is "six hundred sixty-six billion, seven hundred million, four hundred six thousand, six hundred sixty-eight".