12644215262511 has 48 divisors (see below), whose sum is σ = 20784157341696. Its totient is φ = 6793992785664.

The previous prime is 12644215262411. The next prime is 12644215262521. The reversal of 12644215262511 is 11526251244621.

It is not a de Polignac number, because 12644215262511 - 2¹⁴ = 12644215246127 is a prime.

It is a super-2 number, since 2×12644215262511² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12644215262521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 389040 + ... + 5043786.

It is an arithmetic number, because the mean of its divisors is an integer number (433003277952).

Almost surely, 2^{12644215262511} is an apocalyptic number.

12644215262511 is a deficient number, since it is larger than the sum of its proper divisors (8139942079185).

12644215262511 is a wasteful number, since it uses less digits than its factorization.

12644215262511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4655868 (or 4655861 counting only the distinct ones).

The product of its digits is 230400, while the sum is 42.

The spelling of 12644215262511 in words is "twelve trillion, six hundred forty-four billion, two hundred fifteen million, two hundred sixty-two thousand, five hundred eleven".