12665686 has 16 divisors (see below), whose sum is σ = 21627648. Its totient is φ = 5506600.

The previous prime is 12665677. The next prime is 12665687. The reversal of 12665686 is 68656621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12665687) 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, 12010 + ... + 13021.

It is an arithmetic number, because the mean of its divisors is an integer number (1351728).

Almost surely, 2^12665686 is an apocalyptic number.

12665686 is a deficient number, since it is larger than the sum of its proper divisors (8961962).

12665686 is a wasteful number, since it uses less digits than its factorization.

12665686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25067.

The product of its digits is 103680, while the sum is 40.

The square root of 12665686 is about 3558.8883095708. Note that the first 3 decimals coincide. The cubic root of 12665686 is about 233.1003393043.

The spelling of 12665686 in words is "twelve million, six hundred sixty-five thousand, six hundred eighty-six".