669197136 has 20 divisors (see below), whose sum is σ = 1728759392. Its totient is φ = 223065696.

The previous prime is 669197131. The next prime is 669197159. The reversal of 669197136 is 631791966.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 13941607 = 669197136 / (6 + 6 + 9 + 1 + 9 + 7 + 1 + 3 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669197131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6970756 + ... + 6970851.

Almost surely, 2^669197136 is an apocalyptic number.

It is an amenable number.

669197136 is an abundant number, since it is smaller than the sum of its proper divisors (1059562256).

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

669197136 is a wasteful number, since it uses less digits than its factorization.

669197136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13941618 (or 13941612 counting only the distinct ones).

The product of its digits is 367416, while the sum is 48.

The square root of 669197136 is about 25868.8448911040. The cubic root of 669197136 is about 874.6843535219.

The spelling of 669197136 in words is "six hundred sixty-nine million, one hundred ninety-seven thousand, one hundred thirty-six".