12643603556 has 12 divisors (see below), whose sum is σ = 22640871792. Its totient is φ = 6174783048.

The previous prime is 12643603499. The next prime is 12643603571. The reversal of 12643603556 is 65530634621.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

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, 36754490 + ... + 36754833.

It is an arithmetic number, because the mean of its divisors is an integer number (1886739316).

Almost surely, 2^12643603556 is an apocalyptic number.

It is an amenable number.

12643603556 is a deficient number, since it is larger than the sum of its proper divisors (9997268236).

12643603556 is a wasteful number, since it uses less digits than its factorization.

12643603556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73509370 (or 73509368 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 12643603556 in words is "twelve billion, six hundred forty-three million, six hundred three thousand, five hundred fifty-six".