12536863521 has 32 divisors (see below), whose sum is σ = 20598681600. Its totient is φ = 6604697664.

The previous prime is 12536863511. The next prime is 12536863579.

12536863521 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12536863521 - 2⁵ = 12536863489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12536863511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 196780 + ... + 252578.

It is an arithmetic number, because the mean of its divisors is an integer number (643708800).

Almost surely, 2^12536863521 is an apocalyptic number.

It is an amenable number.

12536863521 is a deficient number, since it is larger than the sum of its proper divisors (8061818079).

12536863521 is a wasteful number, since it uses less digits than its factorization.

12536863521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56645.

The product of its digits is 259200, while the sum is 42.

The spelling of 12536863521 in words is "twelve billion, five hundred thirty-six million, eight hundred sixty-three thousand, five hundred twenty-one".