12644238615 has 64 divisors (see below), whose sum is σ = 21868019712. Its totient is φ = 6220368000.

The previous prime is 12644238589. The next prime is 12644238637. The reversal of 12644238615 is 51683244621.

It is not a de Polignac number, because 12644238615 - 2¹⁴ = 12644222231 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3281440 + ... + 3285290.

It is an arithmetic number, because the mean of its divisors is an integer number (341687808).

Almost surely, 2^12644238615 is an apocalyptic number.

12644238615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12644238615 is a deficient number, since it is larger than the sum of its proper divisors (9223781097).

12644238615 is a wasteful number, since it uses less digits than its factorization.

12644238615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4220.

The product of its digits is 276480, while the sum is 42.

The spelling of 12644238615 in words is "twelve billion, six hundred forty-four million, two hundred thirty-eight thousand, six hundred fifteen".