668843939692 has 24 divisors (see below), whose sum is σ = 1171514412432. Its totient is φ = 334125662400.

The previous prime is 668843939663. The next prime is 668843939711. The reversal of 668843939692 is 296939348866.

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, 25572942 + ... + 25599082.

It is an arithmetic number, because the mean of its divisors is an integer number (48813100518).

Almost surely, 2^668843939692 is an apocalyptic number.

It is an amenable number.

668843939692 is a deficient number, since it is larger than the sum of its proper divisors (502670472740).

668843939692 is a wasteful number, since it uses less digits than its factorization.

668843939692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31569 (or 31567 counting only the distinct ones).

The product of its digits is 725594112, while the sum is 73.

The spelling of 668843939692 in words is "six hundred sixty-eight billion, eight hundred forty-three million, nine hundred thirty-nine thousand, six hundred ninety-two".