12591112816 has 40 divisors (see below), whose sum is σ = 25283649600. Its totient is φ = 6067111680.

The previous prime is 12591112741. The next prime is 12591112817. The reversal of 12591112816 is 61821119521.

It is a happy number.

It is a super-2 number, since 2×12591112816² (a number of 21 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 225945 + ... + 276103.

It is an arithmetic number, because the mean of its divisors is an integer number (632091240).

Almost surely, 2^12591112816 is an apocalyptic number.

12591112816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12591112816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12641824800).

12591112816 is an abundant number, since it is smaller than the sum of its proper divisors (12692536784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12591112816 is a wasteful number, since it uses less digits than its factorization.

12591112816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50737 (or 50731 counting only the distinct ones).

The product of its digits is 8640, while the sum is 37.

The spelling of 12591112816 in words is "twelve billion, five hundred ninety-one million, one hundred twelve thousand, eight hundred sixteen".