12405666623 has 8 divisors (see below), whose sum is σ = 14181756960. Its totient is φ = 10630539360.

The previous prime is 12405666613. The next prime is 12405666659. The reversal of 12405666623 is 32666650421.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12405666623 - 2²⁰ = 12404618047 is a prime.

It is a super-2 number, since 2×12405666623² (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 (12405666613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212948 + ... + 264873.

It is an arithmetic number, because the mean of its divisors is an integer number (1772719620).

Almost surely, 2^12405666623 is an apocalyptic number.

12405666623 is a deficient number, since it is larger than the sum of its proper divisors (1776090337).

12405666623 is an equidigital number, since it uses as much as digits as its factorization.

12405666623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481537.

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 12405666623 in words is "twelve billion, four hundred five million, six hundred sixty-six thousand, six hundred twenty-three".