12644058636 has 48 divisors (see below), whose sum is σ = 35760977280. Its totient is φ = 3831532560.

The previous prime is 12644058619. The next prime is 12644058671. The reversal of 12644058636 is 63685044621.

12644058636 is a `hidden beast` number, since 1 + 2 + 6 + 4 + 4 + 0 + 5 + 8 + 636 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 12644058591 and 12644058600.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5320386 + ... + 5322761.

It is an arithmetic number, because the mean of its divisors is an integer number (745020360).

Almost surely, 2^12644058636 is an apocalyptic number.

It is an amenable number.

12644058636 is an abundant number, since it is smaller than the sum of its proper divisors (23116918644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12644058636 is a wasteful number, since it uses less digits than its factorization.

12644058636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10643171 (or 10643163 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The spelling of 12644058636 in words is "twelve billion, six hundred forty-four million, fifty-eight thousand, six hundred thirty-six".