668911356 has 72 divisors (see below), whose sum is σ = 1716833664. Its totient is φ = 219572640.

The previous prime is 668911343. The next prime is 668911381. The reversal of 668911356 is 653119866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 812361 + ... + 813183.

It is an arithmetic number, because the mean of its divisors is an integer number (23844912).

Almost surely, 2^668911356 is an apocalyptic number.

It is an amenable number.

668911356 is an abundant number, since it is smaller than the sum of its proper divisors (1047922308).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668911356 is a wasteful number, since it uses less digits than its factorization.

668911356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151 (or 1146 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 668911356 is about 25863.3206684679. The cubic root of 668911356 is about 874.5598247534.

The spelling of 668911356 in words is "six hundred sixty-eight million, nine hundred eleven thousand, three hundred fifty-six".