12666971 has 4 divisors (see below), whose sum is σ = 12675312. Its totient is φ = 12658632.

The previous prime is 12666967. The next prime is 12667001. The reversal of 12666971 is 17966621.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12666971 - 2² = 12666967 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12666911) 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, 1175 + ... + 5168.

It is an arithmetic number, because the mean of its divisors is an integer number (3168828).

Almost surely, 2^12666971 is an apocalyptic number.

12666971 is a deficient number, since it is larger than the sum of its proper divisors (8341).

12666971 is an equidigital number, since it uses as much as digits as its factorization.

12666971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8340.

The product of its digits is 27216, while the sum is 38.

The square root of 12666971 is about 3559.0688388959. The cubic root of 12666971 is about 233.1082221200.

The spelling of 12666971 in words is "twelve million, six hundred sixty-six thousand, nine hundred seventy-one".