12644540111 has 12 divisors (see below), whose sum is σ = 14759172792. Its totient is φ = 10801174608.

The previous prime is 12644540087. The next prime is 12644540113. The reversal of 12644540111 is 11104544621.

It is not a de Polignac number, because 12644540111 - 2¹⁸ = 12644277967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12644540113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 426005 + ... + 454718.

It is an arithmetic number, because the mean of its divisors is an integer number (1229931066).

Almost surely, 2^12644540111 is an apocalyptic number.

12644540111 is a deficient number, since it is larger than the sum of its proper divisors (2114632681).

12644540111 is an equidigital number, since it uses as much as digits as its factorization.

12644540111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881030 (or 881023 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The spelling of 12644540111 in words is "twelve billion, six hundred forty-four million, five hundred forty thousand, one hundred eleven".