23525551521 has 8 divisors (see below), whose sum is σ = 34852668960. Its totient is φ = 15683700996.

The previous prime is 23525551513. The next prime is 23525551549. The reversal of 23525551521 is 12515552532.

23525551521 is a `hidden beast` number, since 2 + 3 + 52 + 5 + 551 + 52 + 1 = 666.

It is not a de Polignac number, because 23525551521 - 2³ = 23525551513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23525551561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 435658335 + ... + 435658388.

It is an arithmetic number, because the mean of its divisors is an integer number (4356583620).

Almost surely, 2^23525551521 is an apocalyptic number.

It is an amenable number.

23525551521 is a deficient number, since it is larger than the sum of its proper divisors (11327117439).

23525551521 is an equidigital number, since it uses as much as digits as its factorization.

23525551521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871316732 (or 871316726 counting only the distinct ones).

The product of its digits is 75000, while the sum is 36.

The spelling of 23525551521 in words is "twenty-three billion, five hundred twenty-five million, five hundred fifty-one thousand, five hundred twenty-one".