12666819732 has 24 divisors (see below), whose sum is σ = 33778186176. Its totient is φ = 3619091328.

The previous prime is 12666819727. The next prime is 12666819733. The reversal of 12666819732 is 23791866621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12666819733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75397653 + ... + 75397820.

It is an arithmetic number, because the mean of its divisors is an integer number (1407424424).

Almost surely, 2^12666819732 is an apocalyptic number.

12666819732 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12666819732 is an abundant number, since it is smaller than the sum of its proper divisors (21111366444).

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

12666819732 is a wasteful number, since it uses less digits than its factorization.

12666819732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150795487 (or 150795485 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 51.

The spelling of 12666819732 in words is "twelve billion, six hundred sixty-six million, eight hundred nineteen thousand, seven hundred thirty-two".