12555055521 has 24 divisors (see below), whose sum is σ = 19365615360. Its totient is φ = 7820719200.

The previous prime is 12555055511. The next prime is 12555055531.

12555055521 is a `hidden beast` number, since 1 + 2 + 5 + 550 + 55 + 52 + 1 = 666.

12555055521 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (12555055511) and next prime (12555055531).

It is not a de Polignac number, because 12555055521 - 2⁷ = 12555055393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12555055511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 767775 + ... + 783956.

It is an arithmetic number, because the mean of its divisors is an integer number (806900640).

Almost surely, 2^12555055521 is an apocalyptic number.

It is an amenable number.

12555055521 is a deficient number, since it is larger than the sum of its proper divisors (6810559839).

12555055521 is a wasteful number, since it uses less digits than its factorization.

12555055521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1551797 (or 1551794 counting only the distinct ones).

The product of its (nonzero) digits is 62500, while the sum is 36.

The spelling of 12555055521 in words is "twelve billion, five hundred fifty-five million, fifty-five thousand, five hundred twenty-one".