12515501551 has 24 divisors (see below), whose sum is σ = 15071940000. Its totient is φ = 10350051264.

The previous prime is 12515501519. The next prime is 12515501569. The reversal of 12515501551 is 15510551521.

It is a happy number.

It is not a de Polignac number, because 12515501551 - 2⁵ = 12515501519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12515501501) 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, 2767270 + ... + 2771788.

It is an arithmetic number, because the mean of its divisors is an integer number (627997500).

Almost surely, 2^12515501551 is an apocalyptic number.

12515501551 is a deficient number, since it is larger than the sum of its proper divisors (2556438449).

12515501551 is a wasteful number, since it uses less digits than its factorization.

12515501551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6511 (or 6504 counting only the distinct ones).

The product of its (nonzero) digits is 6250, while the sum is 31.

The spelling of 12515501551 in words is "twelve billion, five hundred fifteen million, five hundred one thousand, five hundred fifty-one".