12591111744 has 140 divisors (see below), whose sum is σ = 39519805644. Its totient is φ = 3950125056.

The previous prime is 12591111739. The next prime is 12591111817. The reversal of 12591111744 is 44711119521.

12591111744 is a `hidden beast` number, since 1 + 2 + 591 + 11 + 17 + 44 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 10467745344 + 2123366400 = 102312^2 + 46080^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 12591111699 and 12591111708.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16692 + ... + 159564.

Almost surely, 2^12591111744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12591111744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19759902822).

12591111744 is an abundant number, since it is smaller than the sum of its proper divisors (26928693900).

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

12591111744 is a wasteful number, since it uses less digits than its factorization.

12591111744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142914 (or 142895 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The spelling of 12591111744 in words is "twelve billion, five hundred ninety-one million, one hundred eleven thousand, seven hundred forty-four".