12644251332536 has 16 divisors (see below), whose sum is σ = 23708179177800. Its totient is φ = 6322070218464.

The previous prime is 12644251332523. The next prime is 12644251332569. The reversal of 12644251332536 is 63523315244621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5953706 + ... + 7793273.

Almost surely, 2^{12644251332536} is an apocalyptic number.

It is an amenable number.

12644251332536 is a deficient number, since it is larger than the sum of its proper divisors (11063927845264).

12644251332536 is a wasteful number, since it uses less digits than its factorization.

12644251332536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13861958 (or 13861954 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 47.

The spelling of 12644251332536 in words is "twelve trillion, six hundred forty-four billion, two hundred fifty-one million, three hundred thirty-two thousand, five hundred thirty-six".