12666799 has 4 divisors (see below), whose sum is σ = 12678120. Its totient is φ = 12655480.

The previous prime is 12666779. The next prime is 12666803. The reversal of 12666799 is 99766621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12666799 - 2⁷ = 12666671 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12666779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3772 + ... + 6289.

It is an arithmetic number, because the mean of its divisors is an integer number (3169530).

Almost surely, 2^12666799 is an apocalyptic number.

12666799 is a deficient number, since it is larger than the sum of its proper divisors (11321).

12666799 is a wasteful number, since it uses less digits than its factorization.

12666799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11320.

The product of its digits is 244944, while the sum is 46.

The square root of 12666799 is about 3559.0446751902. The cubic root of 12666799 is about 233.1071670192.

The spelling of 12666799 in words is "twelve million, six hundred sixty-six thousand, seven hundred ninety-nine".