12664217 has 2 divisors, whose sum is σ = 12664218. Its totient is φ = 12664216.

The previous prime is 12664207. The next prime is 12664247. The reversal of 12664217 is 71246621.

12664217 is digitally balanced in base 2 and base 3, because in such bases 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., 8620096 + 4044121 = 2936^2 + 2011^2 .

It is a cyclic number.

It is not a de Polignac number, because 12664217 - 2⁶ = 12664153 is a prime.

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 12664217.

It is not a weakly prime, because it can be changed into another prime (12664207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6332108 + 6332109.

It is an arithmetic number, because the mean of its divisors is an integer number (6332109).

Almost surely, 2^12664217 is an apocalyptic number.

It is an amenable number.

12664217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12664217 is an equidigital number, since it uses as much as digits as its factorization.

12664217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 29.

The square root of 12664217 is about 3558.6819189132. The cubic root of 12664217 is about 233.0913270898.

The spelling of 12664217 in words is "twelve million, six hundred sixty-four thousand, two hundred seventeen".