12664304621 has 2 divisors, whose sum is σ = 12664304622. Its totient is φ = 12664304620.

The previous prime is 12664304603. The next prime is 12664304633. The reversal of 12664304621 is 12640346621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10577094025 + 2087210596 = 102845^2 + 45686^2 .

It is a cyclic number.

It is not a de Polignac number, because 12664304621 - 2¹⁸ = 12664042477 is a prime.

It is a super-2 number, since 2×12664304621² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12664304641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6332152310 + 6332152311.

It is an arithmetic number, because the mean of its divisors is an integer number (6332152311).

Almost surely, 2^12664304621 is an apocalyptic number.

It is an amenable number.

12664304621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12664304621 is an equidigital number, since it uses as much as digits as its factorization.

12664304621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 35.

The spelling of 12664304621 in words is "twelve billion, six hundred sixty-four million, three hundred four thousand, six hundred twenty-one".