12666533631 has 16 divisors (see below), whose sum is σ = 16930131456. Its totient is φ = 8423670816.

The previous prime is 12666533623. The next prime is 12666533641. The reversal of 12666533631 is 13633566621.

It is not a de Polignac number, because 12666533631 - 2³ = 12666533623 is a prime.

It is a super-2 number, since 2×12666533631² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12666533641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3277006 + ... + 3280868.

It is an arithmetic number, because the mean of its divisors is an integer number (1058133216).

Almost surely, 2^12666533631 is an apocalyptic number.

12666533631 is a deficient number, since it is larger than the sum of its proper divisors (4263597825).

12666533631 is a wasteful number, since it uses less digits than its factorization.

12666533631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6262.

The product of its digits is 349920, while the sum is 42.

The spelling of 12666533631 in words is "twelve billion, six hundred sixty-six million, five hundred thirty-three thousand, six hundred thirty-one".