12236563161 has 63 divisors (see below), whose sum is σ = 19570340973. Its totient is φ = 7645985280.

The previous prime is 12236563159. The next prime is 12236563177. The reversal of 12236563161 is 16136563221.

The square root of 12236563161 is 110619.

It is a perfect power (a square), and thus also a powerful number.

12236563161 is a `hidden beast` number, since 1 + 2 + 2 + 36 + 563 + 1 + 61 = 666.

12236563161 is nontrivially palindromic in base 8.

It can be written as a sum of positive squares in 4 ways, for example, as 3448625625 + 8787937536 = 58725^2 + 93744^2 .

It is not a de Polignac number, because 12236563161 - 2¹ = 12236563159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12236563561) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 50774001 + ... + 50774241.

Almost surely, 2^12236563161 is an apocalyptic number.

12236563161 is the 110619-th square number.

12236563161 is the 55310-th centered octagonal number.

It is an amenable number.

12236563161 is a deficient number, since it is larger than the sum of its proper divisors (7333777812).

12236563161 is an frugal number, since it uses more digits than its factorization.

12236563161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534 (or 261 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

Multiplying 12236563161 by its sum of digits (36), we get a square (440516273796 = 663714²).

The spelling of 12236563161 in words is "twelve billion, two hundred thirty-six million, five hundred sixty-three thousand, one hundred sixty-one".