12661973975 has 12 divisors (see below), whose sum is σ = 17943826224. Its totient is φ = 8682496320.

The previous prime is 12661973941. The next prime is 12661974001. The reversal of 12661973975 is 57937916621.

It is not a de Polignac number, because 12661973975 - 2⁶ = 12661973911 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12661973975.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36176894 + ... + 36177243.

It is an arithmetic number, because the mean of its divisors is an integer number (1495318852).

Almost surely, 2^12661973975 is an apocalyptic number.

12661973975 is a deficient number, since it is larger than the sum of its proper divisors (5281852249).

12661973975 is an equidigital number, since it uses as much as digits as its factorization.

12661973975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72354154 (or 72354149 counting only the distinct ones).

The product of its digits is 4286520, while the sum is 56.

The spelling of 12661973975 in words is "twelve billion, six hundred sixty-one million, nine hundred seventy-three thousand, nine hundred seventy-five".