12217159665 has 64 divisors (see below), whose sum is σ = 22827571200. Its totient is φ = 6187465152.

The previous prime is 12217159651. The next prime is 12217159729. The reversal of 12217159665 is 56695171221.

It is a happy number.

It is not a de Polignac number, because 12217159665 - 2²² = 12212965361 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 12217159665.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 417442 + ... + 445748.

It is an arithmetic number, because the mean of its divisors is an integer number (356680800).

Almost surely, 2^12217159665 is an apocalyptic number.

12217159665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12217159665 is a deficient number, since it is larger than the sum of its proper divisors (10610411535).

12217159665 is a wasteful number, since it uses less digits than its factorization.

12217159665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28483 (or 28477 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The spelling of 12217159665 in words is "twelve billion, two hundred seventeen million, one hundred fifty-nine thousand, six hundred sixty-five".