12666015 has 24 divisors (see below), whose sum is σ = 22287408. Its totient is φ = 6652800.

The previous prime is 12665987. The next prime is 12666019. The reversal of 12666015 is 51066621.

It is a happy number.

It is not a de Polignac number, because 12666015 - 2¹⁰ = 12664991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12666015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12666019) 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, 915 + ... + 5115.

It is an arithmetic number, because the mean of its divisors is an integer number (928642).

Almost surely, 2^12666015 is an apocalyptic number.

12666015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12666015 is a deficient number, since it is larger than the sum of its proper divisors (9621393).

12666015 is a wasteful number, since it uses less digits than its factorization.

12666015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4279 (or 4276 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 12666015 is about 3558.9345315698. The cubic root of 12666015 is about 233.1023576013.

The spelling of 12666015 in words is "twelve million, six hundred sixty-six thousand, fifteen".