669318920 has 32 divisors (see below), whose sum is σ = 1520887320. Its totient is φ = 265075200.

The previous prime is 669318911. The next prime is 669318943. The reversal of 669318920 is 29813966.

It can be written as a sum of positive squares in 4 ways, for example, as 664505284 + 4813636 = 25778^2 + 2194^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78797 + ... + 86876.

Almost surely, 2^669318920 is an apocalyptic number.

It is an amenable number.

669318920 is an abundant number, since it is smaller than the sum of its proper divisors (851568400).

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

669318920 is a wasteful number, since it uses less digits than its factorization.

669318920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165785 (or 165781 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 669318920 is about 25871.1986579671. The cubic root of 669318920 is about 874.7374101836.

The spelling of 669318920 in words is "six hundred sixty-nine million, three hundred eighteen thousand, nine hundred twenty".