668818900 has 36 divisors (see below), whose sum is σ = 1453587520. Its totient is φ = 267112800.

The previous prime is 668818889. The next prime is 668818903. The reversal of 668818900 is 9818866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668818903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64261 + ... + 73939.

Almost surely, 2^668818900 is an apocalyptic number.

It is an amenable number.

668818900 is an abundant number, since it is smaller than the sum of its proper divisors (784768620).

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

668818900 is a wasteful number, since it uses less digits than its factorization.

668818900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10384 (or 10377 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 668818900 is about 25861.5332105426. The cubic root of 668818900 is about 874.5195294147.

The spelling of 668818900 in words is "six hundred sixty-eight million, eight hundred eighteen thousand, nine hundred".