668718606 has 32 divisors (see below), whose sum is σ = 1401447168. Its totient is φ = 212319360.

The previous prime is 668718587. The next prime is 668718691. The reversal of 668718606 is 606817866.

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, 23205 + ... + 43311.

It is an arithmetic number, because the mean of its divisors is an integer number (43795224).

Almost surely, 2^668718606 is an apocalyptic number.

668718606 is an abundant number, since it is smaller than the sum of its proper divisors (732728562).

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

668718606 is a wasteful number, since it uses less digits than its factorization.

668718606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20376.

The product of its (nonzero) digits is 580608, while the sum is 48.

The square root of 668718606 is about 25859.5940803409. The cubic root of 668718606 is about 874.4758138208.

The spelling of 668718606 in words is "six hundred sixty-eight million, seven hundred eighteen thousand, six hundred six".