12591321457 has 32 divisors (see below), whose sum is σ = 15666416640. Its totient is φ = 9955725120.

The previous prime is 12591321433. The next prime is 12591321517. The reversal of 12591321457 is 75412319521.

It is not a de Polignac number, because 12591321457 - 2⁷ = 12591321329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12591321257) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 191794 + ... + 248932.

It is an arithmetic number, because the mean of its divisors is an integer number (489575520).

Almost surely, 2^12591321457 is an apocalyptic number.

It is an amenable number.

12591321457 is a deficient number, since it is larger than the sum of its proper divisors (3075095183).

12591321457 is a wasteful number, since it uses less digits than its factorization.

12591321457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57253.

The product of its digits is 75600, while the sum is 40.

The spelling of 12591321457 in words is "twelve billion, five hundred ninety-one million, three hundred twenty-one thousand, four hundred fifty-seven".