12644501243 has 4 divisors (see below), whose sum is σ = 13794001368. Its totient is φ = 11495001120.

The previous prime is 12644501231. The next prime is 12644501297. The reversal of 12644501243 is 34210544621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12644501243 - 2²⁸ = 12376065787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12644509243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 574750046 + ... + 574750067.

It is an arithmetic number, because the mean of its divisors is an integer number (3448500342).

Almost surely, 2^12644501243 is an apocalyptic number.

12644501243 is a deficient number, since it is larger than the sum of its proper divisors (1149500125).

12644501243 is a wasteful number, since it uses less digits than its factorization.

12644501243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149500124.

The product of its (nonzero) digits is 23040, while the sum is 32.

The spelling of 12644501243 in words is "twelve billion, six hundred forty-four million, five hundred one thousand, two hundred forty-three".