12666522321 has 24 divisors (see below), whose sum is σ = 18627860160. Its totient is φ = 8291556576.

The previous prime is 12666522307. The next prime is 12666522353. The reversal of 12666522321 is 12322566621.

It is not a de Polignac number, because 12666522321 - 2⁵ = 12666522289 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12666522301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 457551 + ... + 484443.

It is an arithmetic number, because the mean of its divisors is an integer number (776160840).

Almost surely, 2^12666522321 is an apocalyptic number.

It is an amenable number.

12666522321 is a deficient number, since it is larger than the sum of its proper divisors (5961337839).

12666522321 is a wasteful number, since it uses less digits than its factorization.

12666522321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27845 (or 27842 counting only the distinct ones).

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

The spelling of 12666522321 in words is "twelve billion, six hundred sixty-six million, five hundred twenty-two thousand, three hundred twenty-one".