12666623 has 8 divisors (see below), whose sum is σ = 12902400. Its totient is φ = 12432888.

The previous prime is 12666607. The next prime is 12666671. The reversal of 12666623 is 32666621.

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

It is a cyclic number.

It is not a de Polignac number, because 12666623 - 2⁴ = 12666607 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 12666623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12662623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17258 + ... + 17976.

It is an arithmetic number, because the mean of its divisors is an integer number (1612800).

Almost surely, 2^12666623 is an apocalyptic number.

12666623 is a deficient number, since it is larger than the sum of its proper divisors (235777).

12666623 is an equidigital number, since it uses as much as digits as its factorization.

12666623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021.

The product of its digits is 15552, while the sum is 32.

The square root of 12666623 is about 3559.0199493681. The cubic root of 12666623 is about 233.1060873712.

The spelling of 12666623 in words is "twelve million, six hundred sixty-six thousand, six hundred twenty-three".