636816972474 has 24 divisors (see below), whose sum is σ = 1380285628020. Its totient is φ = 212193013248.

The previous prime is 636816972457. The next prime is 636816972481. The reversal of 636816972474 is 474279618636.

It is a happy number.

636816972474 is a `hidden beast` number, since 6 + 3 + 68 + 16 + 97 + 2 + 474 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 387061912449 + 249755060025 = 622143^2 + 499755^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6559719 + ... + 6656090.

Almost surely, 2^636816972474 is an apocalyptic number.

636816972474 is an abundant number, since it is smaller than the sum of its proper divisors (743468655546).

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

636816972474 is a wasteful number, since it uses less digits than its factorization.

636816972474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13218494 (or 13218491 counting only the distinct ones).

The product of its digits is 73156608, while the sum is 63.

The spelling of 636816972474 in words is "six hundred thirty-six billion, eight hundred sixteen million, nine hundred seventy-two thousand, four hundred seventy-four".