12664444501 has 2 divisors, whose sum is σ = 12664444502. Its totient is φ = 12664444500.

The previous prime is 12664444489. The next prime is 12664444511. The reversal of 12664444501 is 10544446621.

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., 9034502500 + 3629942001 = 95050^2 + 60249^2 .

It is an emirp because it is prime and its reverse (10544446621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12664444501 - 2⁵ = 12664444469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12664444511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6332222250 + 6332222251.

It is an arithmetic number, because the mean of its divisors is an integer number (6332222251).

Almost surely, 2^12664444501 is an apocalyptic number.

It is an amenable number.

12664444501 is a deficient number, since it is larger than the sum of its proper divisors (1).

12664444501 is an equidigital number, since it uses as much as digits as its factorization.

12664444501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92160, while the sum is 37.

The spelling of 12664444501 in words is "twelve billion, six hundred sixty-four million, four hundred forty-four thousand, five hundred one".