12223125666 has 20 divisors (see below), whose sum is σ = 27388856022. Its totient is φ = 4074375168.

The previous prime is 12223125659. The next prime is 12223125679. The reversal of 12223125666 is 66652132221.

It can be written as a sum of positive squares in only one way, i.e., 9678427641 + 2544698025 = 98379^2 + 50445^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12223125666.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 37725535 + ... + 37725858.

Almost surely, 2^12223125666 is an apocalyptic number.

12223125666 is an abundant number, since it is smaller than the sum of its proper divisors (15165730356).

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

12223125666 is an equidigital number, since it uses as much as digits as its factorization.

12223125666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75451407 (or 75451398 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

Adding to 12223125666 its reverse (66652132221), we get a palindrome (78875257887).

The spelling of 12223125666 in words is "twelve billion, two hundred twenty-three million, one hundred twenty-five thousand, six hundred sixty-six".