12644551775 has 24 divisors (see below), whose sum is σ = 16512276480. Its totient is φ = 9578705760.

The previous prime is 12644551769. The next prime is 12644551781. The reversal of 12644551775 is 57715544621.

It is an interprime number because it is at equal distance from previous prime (12644551769) and next prime (12644551781).

It is not a de Polignac number, because 12644551775 - 2¹² = 12644547679 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 23 ways as a sum of consecutive naturals, for example, 1271372 + ... + 1281278.

It is an arithmetic number, because the mean of its divisors is an integer number (688011520).

Almost surely, 2^12644551775 is an apocalyptic number.

12644551775 is a deficient number, since it is larger than the sum of its proper divisors (3867724705).

12644551775 is a wasteful number, since it uses less digits than its factorization.

12644551775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12623 (or 12618 counting only the distinct ones).

The product of its digits is 1176000, while the sum is 47.

The spelling of 12644551775 in words is "twelve billion, six hundred forty-four million, five hundred fifty-one thousand, seven hundred seventy-five".