668006704666 has 64 divisors (see below), whose sum is σ = 1253324793600. Its totient is φ = 260538453504.

The previous prime is 668006704613. The next prime is 668006704667. The reversal of 668006704666 is 666407600866.

It is not an unprimeable number, because it can be changed into a prime (668006704667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1299870 + ... + 1739446.

It is an arithmetic number, because the mean of its divisors is an integer number (19583199900).

Almost surely, 2^668006704666 is an apocalyptic number.

668006704666 is a deficient number, since it is larger than the sum of its proper divisors (585318088934).

668006704666 is a wasteful number, since it uses less digits than its factorization.

668006704666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439831.

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

The spelling of 668006704666 in words is "six hundred sixty-eight billion, six million, seven hundred four thousand, six hundred sixty-six".