668644076 has 6 divisors (see below), whose sum is σ = 1170127140. Its totient is φ = 334322036.

The previous prime is 668644049. The next prime is 668644079. The reversal of 668644076 is 670446866.

It is a self number, because there is not a number n which added to its sum of digits gives 668644076.

It is not an unprimeable number, because it can be changed into a prime (668644079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83580506 + ... + 83580513.

It is an arithmetic number, because the mean of its divisors is an integer number (195021190).

Almost surely, 2^668644076 is an apocalyptic number.

It is an amenable number.

668644076 is a deficient number, since it is larger than the sum of its proper divisors (501483064).

668644076 is a wasteful number, since it uses less digits than its factorization.

668644076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167161023 (or 167161021 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 47.

The square root of 668644076 is about 25858.1529889511. The cubic root of 668644076 is about 874.4433252657.

The spelling of 668644076 in words is "six hundred sixty-eight million, six hundred forty-four thousand, seventy-six".