12564846521 has 16 divisors (see below), whose sum is σ = 12805732800. Its totient is φ = 12326683200.

The previous prime is 12564846517. The next prime is 12564846527.

12564846521 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 12564846521 - 2² = 12564846517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12564846527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8471846 + ... + 8473328.

It is an arithmetic number, because the mean of its divisors is an integer number (800358300).

Almost surely, 2^12564846521 is an apocalyptic number.

It is an amenable number.

12564846521 is a deficient number, since it is larger than the sum of its proper divisors (240886279).

12564846521 is a wasteful number, since it uses less digits than its factorization.

12564846521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2296.

The product of its digits is 460800, while the sum is 44.

The spelling of 12564846521 in words is "twelve billion, five hundred sixty-four million, eight hundred forty-six thousand, five hundred twenty-one".