12515515243 has 32 divisors (see below), whose sum is σ = 16801758720. Its totient is φ = 9023055360.

The previous prime is 12515515231. The next prime is 12515515247. The reversal of 12515515243 is 34251551521.

It is not a de Polignac number, because 12515515243 - 2⁵ = 12515515211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12515515199 and 12515515208.

It is not an unprimeable number, because it can be changed into a prime (12515515247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3796 + ... + 158257.

It is an arithmetic number, because the mean of its divisors is an integer number (525054960).

Almost surely, 2^12515515243 is an apocalyptic number.

12515515243 is a deficient number, since it is larger than the sum of its proper divisors (4286243477).

12515515243 is a wasteful number, since it uses less digits than its factorization.

12515515243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162147.

The product of its digits is 30000, while the sum is 34.

The spelling of 12515515243 in words is "twelve billion, five hundred fifteen million, five hundred fifteen thousand, two hundred forty-three".