12766681 has 2 divisors, whose sum is σ = 12766682. Its totient is φ = 12766680.

The previous prime is 12766669. The next prime is 12766687. The reversal of 12766681 is 18666721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12425625 + 341056 = 3525^2 + 584^2 .

It is a cyclic number.

It is not a de Polignac number, because 12766681 - 2⁷ = 12766553 is a prime.

It is a super-2 number, since 2×12766681² = 325976287511522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12766681.

It is not a weakly prime, because it can be changed into another prime (12766687) 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 as a sum of consecutive naturals, namely, 6383340 + 6383341.

It is an arithmetic number, because the mean of its divisors is an integer number (6383341).

Almost surely, 2^12766681 is an apocalyptic number.

It is an amenable number.

12766681 is a deficient number, since it is larger than the sum of its proper divisors (1).

12766681 is an equidigital number, since it uses as much as digits as its factorization.

12766681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 37.

The square root of 12766681 is about 3573.0492579868. The cubic root of 12766681 is about 233.7182732159.

The spelling of 12766681 in words is "twelve million, seven hundred sixty-six thousand, six hundred eighty-one".