12221610665 has 16 divisors (see below), whose sum is σ = 16389426816. Its totient is φ = 8671651200.

The previous prime is 12221610647. The next prime is 12221610683. The reversal of 12221610665 is 56601612221.

It is an interprime number because it is at equal distance from previous prime (12221610647) and next prime (12221610683).

It is not a de Polignac number, because 12221610665 - 2¹⁸ = 12221348521 is a prime.

It is a Duffinian number.

It is a Curzon number.

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, 2707637 + ... + 2712146.

It is an arithmetic number, because the mean of its divisors is an integer number (1024339176).

Almost surely, 2^12221610665 is an apocalyptic number.

It is an amenable number.

12221610665 is a deficient number, since it is larger than the sum of its proper divisors (4167816151).

12221610665 is a wasteful number, since it uses less digits than its factorization.

12221610665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5419840.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 12221610665 in words is "twelve billion, two hundred twenty-one million, six hundred ten thousand, six hundred sixty-five".