12217873656 has 32 divisors (see below), whose sum is σ = 30824917200. Its totient is φ = 4035260160.

The previous prime is 12217873627. The next prime is 12217873669. The reversal of 12217873656 is 65637871221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2332605 + ... + 2337836.

Almost surely, 2^12217873656 is an apocalyptic number.

It is an amenable number.

12217873656 is an abundant number, since it is smaller than the sum of its proper divisors (18607043544).

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

12217873656 is a wasteful number, since it uses less digits than its factorization.

12217873656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4670559 (or 4670555 counting only the distinct ones).

The product of its digits is 846720, while the sum is 48.

The spelling of 12217873656 in words is "twelve billion, two hundred seventeen million, eight hundred seventy-three thousand, six hundred fifty-six".