23011256556 has 36 divisors (see below), whose sum is σ = 59264844912. Its totient is φ = 7525693344.

The previous prime is 23011256537. The next prime is 23011256579. The reversal of 23011256556 is 65565211032.

23011256556 is a `hidden beast` number, since 2 + 30 + 1 + 12 + 565 + 56 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×23011256556² (a number of 22 digits) contains 22 as substring.

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 23011256556.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6028296 + ... + 6032111.

It is an arithmetic number, because the mean of its divisors is an integer number (1646245692).

Almost surely, 2^23011256556 is an apocalyptic number.

It is an amenable number.

23011256556 is an abundant number, since it is smaller than the sum of its proper divisors (36253588356).

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

23011256556 is a wasteful number, since it uses less digits than its factorization.

23011256556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12060470 (or 12060465 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

Adding to 23011256556 its reverse (65565211032), we get a palindrome (88576467588).

The spelling of 23011256556 in words is "twenty-three billion, eleven million, two hundred fifty-six thousand, five hundred fifty-six".