12766669 has 2 divisors, whose sum is σ = 12766670. Its totient is φ = 12766668.

The previous prime is 12766667. The next prime is 12766681. The reversal of 12766669 is 96666721.

12766669 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6441444 + 6325225 = 2538^2 + 2515^2 .

It is a cyclic number.

It is not a de Polignac number, because 12766669 - 2¹ = 12766667 is a prime.

It is a super-2 number, since 2×12766669² = 325975674711122, which contains 22 as substring.

Together with 12766667, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12766667) 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, 6383334 + 6383335.

It is an arithmetic number, because the mean of its divisors is an integer number (6383335).

Almost surely, 2^12766669 is an apocalyptic number.

It is an amenable number.

12766669 is a deficient number, since it is larger than the sum of its proper divisors (1).

12766669 is an equidigital number, since it uses as much as digits as its factorization.

12766669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 43.

The square root of 12766669 is about 3573.0475787484. The cubic root of 12766669 is about 233.7181999883.

The spelling of 12766669 in words is "twelve million, seven hundred sixty-six thousand, six hundred sixty-nine".