668425693808 has 20 divisors (see below), whose sum is σ = 1295351003688. Its totient is φ = 334141563840.

The previous prime is 668425693783. The next prime is 668425693889. The reversal of 668425693808 is 808396524866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4377791 + ... + 4527902.

Almost surely, 2^668425693808 is an apocalyptic number.

It is an amenable number.

668425693808 is a deficient number, since it is larger than the sum of its proper divisors (626925309880).

668425693808 is a wasteful number, since it uses less digits than its factorization.

668425693808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8910392 (or 8910386 counting only the distinct ones).

The product of its (nonzero) digits is 119439360, while the sum is 65.

The spelling of 668425693808 in words is "six hundred sixty-eight billion, four hundred twenty-five million, six hundred ninety-three thousand, eight hundred eight".