23257212156 has 72 divisors (see below), whose sum is σ = 60995858560. Its totient is φ = 7748663472.

The previous prime is 23257212149. The next prime is 23257212169. The reversal of 23257212156 is 65121275232.

23257212156 is a `hidden beast` number, since 2 + 32 + 572 + 1 + 2 + 1 + 56 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 23257212156.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2626785 + ... + 2635623.

Almost surely, 2^23257212156 is an apocalyptic number.

It is an amenable number.

23257212156 is an abundant number, since it is smaller than the sum of its proper divisors (37738646404).

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

23257212156 is a wasteful number, since it uses less digits than its factorization.

23257212156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11565 (or 11551 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

Adding to 23257212156 its reverse (65121275232), we get a palindrome (88378487388).

The spelling of 23257212156 in words is "twenty-three billion, two hundred fifty-seven million, two hundred twelve thousand, one hundred fifty-six".