12664247 has 2 divisors, whose sum is σ = 12664248. Its totient is φ = 12664246.

The previous prime is 12664217. The next prime is 12664261. The reversal of 12664247 is 74246621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12664247 - 2⁸ = 12663991 is a prime.

It is a congruent number.

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, 6332123 + 6332124.

It is an arithmetic number, because the mean of its divisors is an integer number (6332124).

Almost surely, 2^12664247 is an apocalyptic number.

12664247 is a deficient number, since it is larger than the sum of its proper divisors (1).

12664247 is an equidigital number, since it uses as much as digits as its factorization.

12664247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 32.

The square root of 12664247 is about 3558.6861339545. The cubic root of 12664247 is about 233.0915111447.

The spelling of 12664247 in words is "twelve million, six hundred sixty-four thousand, two hundred forty-seven".