12591112815 has 48 divisors (see below), whose sum is σ = 23284980576. Its totient is φ = 6271948800.

The previous prime is 12591112741. The next prime is 12591112817. The reversal of 12591112815 is 51821119521.

It is a happy number.

It is not a de Polignac number, because 12591112815 - 2⁷ = 12591112687 is a prime.

It is a super-2 number, since 2×12591112815² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12591112815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12591112817) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 37395 + ... + 163035.

It is an arithmetic number, because the mean of its divisors is an integer number (485103762).

Almost surely, 2^12591112815 is an apocalyptic number.

12591112815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12591112815 is a deficient number, since it is larger than the sum of its proper divisors (10693867761).

12591112815 is a wasteful number, since it uses less digits than its factorization.

12591112815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125800 (or 125797 counting only the distinct ones).

The product of its digits is 7200, while the sum is 36.

The spelling of 12591112815 in words is "twelve billion, five hundred ninety-one million, one hundred twelve thousand, eight hundred fifteen".