12666819911 has 2 divisors, whose sum is σ = 12666819912. Its totient is φ = 12666819910.

The previous prime is 12666819899. The next prime is 12666819941. The reversal of 12666819911 is 11991866621.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12666819911 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12666819911.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12666819941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6333409955 + 6333409956.

It is an arithmetic number, because the mean of its divisors is an integer number (6333409956).

Almost surely, 2^12666819911 is an apocalyptic number.

12666819911 is a deficient number, since it is larger than the sum of its proper divisors (1).

12666819911 is an equidigital number, since it uses as much as digits as its factorization.

12666819911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 50.

The spelling of 12666819911 in words is "twelve billion, six hundred sixty-six million, eight hundred nineteen thousand, nine hundred eleven".