13563631161 has 12 divisors (see below), whose sum is σ = 19629522900. Its totient is φ = 9025061760.

The previous prime is 13563631091. The next prime is 13563631177. The reversal of 13563631161 is 16113636531.

13563631161 is a `hidden beast` number, since 1 + 3 + 5 + 6 + 3 + 631 + 16 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7130789136 + 6432842025 = 84444^2 + 80205^2 .

It is not a de Polignac number, because 13563631161 - 2¹⁹ = 13563106873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13563631561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1441636 + ... + 1451013.

It is an arithmetic number, because the mean of its divisors is an integer number (1635793575).

Almost surely, 2^13563631161 is an apocalyptic number.

It is an amenable number.

13563631161 is a deficient number, since it is larger than the sum of its proper divisors (6065891739).

13563631161 is a wasteful number, since it uses less digits than its factorization.

13563631161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2893176 (or 2893173 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The spelling of 13563631161 in words is "thirteen billion, five hundred sixty-three million, six hundred thirty-one thousand, one hundred sixty-one".