12405666631 has 4 divisors (see below), whose sum is σ = 12409848000. Its totient is φ = 12401485264.

The previous prime is 12405666613. The next prime is 12405666659. The reversal of 12405666631 is 13666650421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12405666631 - 2⁷ = 12405666503 is a prime.

It is a super-2 number, since 2×12405666631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12405666671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2086231 + ... + 2092168.

It is an arithmetic number, because the mean of its divisors is an integer number (3102462000).

Almost surely, 2^12405666631 is an apocalyptic number.

12405666631 is a deficient number, since it is larger than the sum of its proper divisors (4181369).

12405666631 is an equidigital number, since it uses as much as digits as its factorization.

12405666631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4181368.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 12405666631 in words is "twelve billion, four hundred five million, six hundred sixty-six thousand, six hundred thirty-one".