12665679 has 24 divisors (see below), whose sum is σ = 18841872. Its totient is φ = 7518720.

The previous prime is 12665677. The next prime is 12665687. The reversal of 12665679 is 97656621.

It is not a de Polignac number, because 12665679 - 2¹ = 12665677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12665679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12665671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142267 + ... + 142355.

It is an arithmetic number, because the mean of its divisors is an integer number (785078).

Almost surely, 2^12665679 is an apocalyptic number.

12665679 is a deficient number, since it is larger than the sum of its proper divisors (6176193).

12665679 is an equidigital number, since it uses as much as digits as its factorization.

With its successor (12665680) it forms an eRAP, since the sums of their prime factors are consecutive (235 and 236).

12665679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235 (or 146 counting only the distinct ones).

The product of its digits is 136080, while the sum is 42.

The square root of 12665679 is about 3558.8873261175. The cubic root of 12665679 is about 233.1002963614.

The spelling of 12665679 in words is "twelve million, six hundred sixty-five thousand, six hundred seventy-nine".