668956768 has 12 divisors (see below), whose sum is σ = 1317008700. Its totient is φ = 334478368.

The previous prime is 668956751. The next prime is 668956787. The reversal of 668956768 is 867659866.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10452418 + ... + 10452481.

It is an arithmetic number, because the mean of its divisors is an integer number (109750725).

Almost surely, 2^668956768 is an apocalyptic number.

It is an amenable number.

668956768 is a deficient number, since it is larger than the sum of its proper divisors (648051932).

668956768 is a wasteful number, since it uses less digits than its factorization.

668956768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20904909 (or 20904901 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 61.

The square root of 668956768 is about 25864.1985764106. The cubic root of 668956768 is about 874.5796154235.

The spelling of 668956768 in words is "six hundred sixty-eight million, nine hundred fifty-six thousand, seven hundred sixty-eight".