668806902 has 32 divisors (see below), whose sum is σ = 1487116800. Its totient is φ = 222803784.

The previous prime is 668806889. The next prime is 668806921. The reversal of 668806902 is 209608866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140599 + ... + 145277.

It is an arithmetic number, because the mean of its divisors is an integer number (46472400).

Almost surely, 2^668806902 is an apocalyptic number.

668806902 is an abundant number, since it is smaller than the sum of its proper divisors (818309898).

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

668806902 is a wasteful number, since it uses less digits than its factorization.

668806902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7337 (or 7331 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 668806902 is about 25861.3012433636. The cubic root of 668806902 is about 874.5143000230.

The spelling of 668806902 in words is "six hundred sixty-eight million, eight hundred six thousand, nine hundred two".