561136631166 has 24 divisors (see below), whose sum is σ = 1222823763720. Its totient is φ = 185964354576.

The previous prime is 561136631147. The next prime is 561136631179. The reversal of 561136631166 is 661136631165.

561136631166 is a `hidden beast` number, since 5 + 6 + 1 + 1 + 3 + 6 + 631 + 1 + 6 + 6 = 666.

It is a congruent number.

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, 90095896 + ... + 90102123.

It is an arithmetic number, because the mean of its divisors is an integer number (50950990155).

Almost surely, 2^561136631166 is an apocalyptic number.

561136631166 is an abundant number, since it is smaller than the sum of its proper divisors (661687132554).

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

561136631166 is a wasteful number, since it uses less digits than its factorization.

561136631166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180198200 (or 180198197 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

Subtracting 561136631166 from its reverse (661136631165), we obtain a palindrome (99999999999).

The spelling of 561136631166 in words is "five hundred sixty-one billion, one hundred thirty-six million, six hundred thirty-one thousand, one hundred sixty-six".