812139969931218 has 12 divisors (see below), whose sum is σ = 1759636601517678. Its totient is φ = 270713323310400.

The previous prime is 812139969931123. The next prime is 812139969931229.

812139969931218 is a `hidden beast` number, since 8 + 1 + 2 + 139 + 96 + 99 + 312 + 1 + 8 = 666.

812139969931218 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 644094300854169 + 168045669077049 = 25379013^2 + 12963243^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22559443609183 + ... + 22559443609218.

Almost surely, 2^{812139969931218} is an apocalyptic number.

812139969931218 is an abundant number, since it is smaller than the sum of its proper divisors (947496631586460).

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

812139969931218 is a wasteful number, since it uses less digits than its factorization.

812139969931218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45118887218409 (or 45118887218406 counting only the distinct ones).

The product of its digits is 90699264, while the sum is 72.

The spelling of 812139969931218 in words is "eight hundred twelve trillion, one hundred thirty-nine billion, nine hundred sixty-nine million, nine hundred thirty-one thousand, two hundred eighteen".