12644243644 has 6 divisors (see below), whose sum is σ = 22127426384. Its totient is φ = 6322121820.

The previous prime is 12644243639. The next prime is 12644243681. The reversal of 12644243644 is 44634244621.

It is a junction number, because it is equal to n+sod(n) for n = 12644243597 and 12644243606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1580530452 + ... + 1580530459.

Almost surely, 2^12644243644 is an apocalyptic number.

It is an amenable number.

12644243644 is a deficient number, since it is larger than the sum of its proper divisors (9483182740).

12644243644 is a wasteful number, since it uses less digits than its factorization.

12644243644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3161060915 (or 3161060913 counting only the distinct ones).

The product of its digits is 442368, while the sum is 40.

The spelling of 12644243644 in words is "twelve billion, six hundred forty-four million, two hundred forty-three thousand, six hundred forty-four".