12666413 has 2 divisors, whose sum is σ = 12666414. Its totient is φ = 12666412.

The previous prime is 12666389. The next prime is 12666421. The reversal of 12666413 is 31466621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11035684 + 1630729 = 3322^2 + 1277^2 .

It is a cyclic number.

It is not a de Polignac number, because 12666413 - 2¹⁸ = 12404269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12660413) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6333206 + 6333207.

It is an arithmetic number, because the mean of its divisors is an integer number (6333207).

Almost surely, 2^12666413 is an apocalyptic number.

It is an amenable number.

12666413 is a deficient number, since it is larger than the sum of its proper divisors (1).

12666413 is an equidigital number, since it uses as much as digits as its factorization.

12666413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 29.

The square root of 12666413 is about 3558.9904467419. The cubic root of 12666413 is about 233.1047991418.

The spelling of 12666413 in words is "twelve million, six hundred sixty-six thousand, four hundred thirteen".