12644476522520 has 16 divisors (see below), whose sum is σ = 28450072175760. Its totient is φ = 5057790608992.

The previous prime is 12644476522493. The next prime is 12644476522553. The reversal of 12644476522520 is 2522567444621.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158055956492 + ... + 158055956571.

It is an arithmetic number, because the mean of its divisors is an integer number (1778129510985).

Almost surely, 2^{12644476522520} is an apocalyptic number.

12644476522520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12644476522520 is an abundant number, since it is smaller than the sum of its proper divisors (15805595653240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12644476522520 is a wasteful number, since it uses less digits than its factorization.

12644476522520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316111913074 (or 316111913070 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 50.

The spelling of 12644476522520 in words is "twelve trillion, six hundred forty-four billion, four hundred seventy-six million, five hundred twenty-two thousand, five hundred twenty".