23215505157 has 18 divisors (see below), whose sum is σ = 36311433522. Its totient is φ = 14286463776.

The previous prime is 23215505143. The next prime is 23215505161. The reversal of 23215505157 is 75150551232.

23215505157 is a `hidden beast` number, since 2 + 3 + 2 + 1 + 550 + 51 + 57 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 893352321 + 22322152836 = 29889^2 + 149406^2 .

It is not a de Polignac number, because 23215505157 - 2¹⁸ = 23215243013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23215501157) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7630138 + ... + 7633179.

Almost surely, 2^23215505157 is an apocalyptic number.

It is an amenable number.

23215505157 is a deficient number, since it is larger than the sum of its proper divisors (13095928365).

23215505157 is a wasteful number, since it uses less digits than its factorization.

23215505157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15263349 (or 15263333 counting only the distinct ones).

The product of its (nonzero) digits is 52500, while the sum is 36.

The spelling of 23215505157 in words is "twenty-three billion, two hundred fifteen million, five hundred five thousand, one hundred fifty-seven".