12664501 has 2 divisors, whose sum is σ = 12664502. Its totient is φ = 12664500.

The previous prime is 12664499. The next prime is 12664511. The reversal of 12664501 is 10546621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12602500 + 62001 = 3550^2 + 249^2 .

It is an emirp because it is prime and its reverse (10546621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12664501 - 2¹ = 12664499 is a prime.

Together with 12664499, 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 (12664511) 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, 6332250 + 6332251.

It is an arithmetic number, because the mean of its divisors is an integer number (6332251).

Almost surely, 2^12664501 is an apocalyptic number.

It is an amenable number.

12664501 is a deficient number, since it is larger than the sum of its proper divisors (1).

12664501 is an equidigital number, since it uses as much as digits as its factorization.

12664501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 12664501 is about 3558.7218211038. The cubic root of 12664501 is about 233.0930694647.

The spelling of 12664501 in words is "twelve million, six hundred sixty-four thousand, five hundred one".