12555500555521 has 24 divisors (see below), whose sum is σ = 15892597651392. Its totient is φ = 9708823581600.

The previous prime is 12555500555513. The next prime is 12555500555531.

12555500555521 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12555500555521 - 2³ = 12555500555513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12555500555531) 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, 56467270 + ... + 56689183.

It is an arithmetic number, because the mean of its divisors is an integer number (662191568808).

Almost surely, 2^{12555500555521} is an apocalyptic number.

12555500555521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12555500555521 is a deficient number, since it is larger than the sum of its proper divisors (3337097095871).

12555500555521 is a wasteful number, since it uses less digits than its factorization.

12555500555521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113156613 (or 113156602 counting only the distinct ones).

The product of its (nonzero) digits is 1562500, while the sum is 46.

The spelling of 12555500555521 in words is "twelve trillion, five hundred fifty-five billion, five hundred million, five hundred fifty-five thousand, five hundred twenty-one".