668755974 has 16 divisors (see below), whose sum is σ = 1340694000. Its totient is φ = 222388320.

The previous prime is 668755957. The next prime is 668755987. The reversal of 668755974 is 479557866.

It is a congruent number.

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, 129849 + ... + 134900.

It is an arithmetic number, because the mean of its divisors is an integer number (83793375).

Almost surely, 2^668755974 is an apocalyptic number.

668755974 is an abundant number, since it is smaller than the sum of its proper divisors (671938026).

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

668755974 is a wasteful number, since it uses less digits than its factorization.

668755974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265175.

The product of its digits is 12700800, while the sum is 57.

The square root of 668755974 is about 25860.3165873893. The cubic root of 668755974 is about 874.4921020888.

The spelling of 668755974 in words is "six hundred sixty-eight million, seven hundred fifty-five thousand, nine hundred seventy-four".