12689464591 has 4 divisors (see below), whose sum is σ = 12695599800. Its totient is φ = 12683329384.

The previous prime is 12689464511. The next prime is 12689464609. The reversal of 12689464591 is 19546498621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12689464591 - 2⁹ = 12689464079 is a prime.

It is a super-2 number, since 2×12689464591² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12689464511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3064501 + ... + 3068638.

It is an arithmetic number, because the mean of its divisors is an integer number (3173899950).

Almost surely, 2^12689464591 is an apocalyptic number.

12689464591 is a deficient number, since it is larger than the sum of its proper divisors (6135209).

12689464591 is an equidigital number, since it uses as much as digits as its factorization.

12689464591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6135208.

The product of its digits is 3732480, while the sum is 55.

The spelling of 12689464591 in words is "twelve billion, six hundred eighty-nine million, four hundred sixty-four thousand, five hundred ninety-one".