668920502 has 4 divisors (see below), whose sum is σ = 1003380756. Its totient is φ = 334460250.

The previous prime is 668920501. The next prime is 668920507. The reversal of 668920502 is 205029866.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668920501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167230124 + ... + 167230127.

It is an arithmetic number, because the mean of its divisors is an integer number (250845189).

Almost surely, 2^668920502 is an apocalyptic number.

668920502 is a deficient number, since it is larger than the sum of its proper divisors (334460254).

668920502 is a wasteful number, since it uses less digits than its factorization.

668920502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334460253.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 668920502 is about 25863.4974819725. The cubic root of 668920502 is about 874.5638106765.

The spelling of 668920502 in words is "six hundred sixty-eight million, nine hundred twenty thousand, five hundred two".