12666331 has 4 divisors (see below), whose sum is σ = 13333000. Its totient is φ = 11999664.

The previous prime is 12666299. The next prime is 12666347. The reversal of 12666331 is 13366621.

12666331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12666331 - 2⁵ = 12666299 is a prime.

It is a super-2 number, since 2×12666331² = 320871882003122, which contains 22 as substring.

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 12666331.

It is not an unprimeable number, because it can be changed into a prime (12666361) 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, 333306 + ... + 333343.

It is an arithmetic number, because the mean of its divisors is an integer number (3333250).

Almost surely, 2^12666331 is an apocalyptic number.

12666331 is a deficient number, since it is larger than the sum of its proper divisors (666669).

12666331 is an equidigital number, since it uses as much as digits as its factorization.

12666331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666668.

The product of its digits is 3888, while the sum is 28.

The square root of 12666331 is about 3558.9789266024. The cubic root of 12666331 is about 233.1042961150.

The spelling of 12666331 in words is "twelve million, six hundred sixty-six thousand, three hundred thirty-one".