12666709 has 4 divisors (see below), whose sum is σ = 13818240. Its totient is φ = 11515180.

The previous prime is 12666701. The next prime is 12666727. The reversal of 12666709 is 90766621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12666709 - 2³ = 12666701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12666701) 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 3 ways as a sum of consecutive naturals, for example, 575749 + ... + 575770.

It is an arithmetic number, because the mean of its divisors is an integer number (3454560).

Almost surely, 2^12666709 is an apocalyptic number.

It is an amenable number.

12666709 is a deficient number, since it is larger than the sum of its proper divisors (1151531).

12666709 is a wasteful number, since it uses less digits than its factorization.

12666709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151530.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 12666709 is about 3559.0320313254. The cubic root of 12666709 is about 233.1066149277.

The spelling of 12666709 in words is "twelve million, six hundred sixty-six thousand, seven hundred nine".