23156489270161 has 27 divisors (see below), whose sum is σ = 25216127536401. Its totient is φ = 21255399101664.

The previous prime is 23156489270147. The next prime is 23156489270171. The reversal of 23156489270161 is 16107298465132.

The square root of 23156489270161 is 4812119.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1441634863761 + 21714854406400 = 1200681^2 + 4659920^2 .

It is not a de Polignac number, because 23156489270161 - 2³³ = 23147899335569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23156489270171) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 12323835820 + ... + 12323837698.

It is a 2-persistent number, because it is pandigital, and so is 2⋅23156489270161 = 46312978540322, but 3⋅23156489270161 = 69469467810483 is not.

Almost surely, 2^{23156489270161} is an apocalyptic number.

23156489270161 is the 4812119-th square number.

23156489270161 is the 2406060-th centered octagonal number.

It is an amenable number.

23156489270161 is a deficient number, since it is larger than the sum of its proper divisors (2059638266240).

23156489270161 is an frugal number, since it uses more digits than its factorization.

23156489270161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4178 (or 2089 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 23156489270161 in words is "twenty-three trillion, one hundred fifty-six billion, four hundred eighty-nine million, two hundred seventy thousand, one hundred sixty-one".