664996969213 has 2 divisors, whose sum is σ = 664996969214. Its totient is φ = 664996969212.

The previous prime is 664996969157. The next prime is 664996969223. The reversal of 664996969213 is 312969699466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 663960966244 + 1036002969 = 814838^2 + 32187^2 .

It is a cyclic number.

It is not a de Polignac number, because 664996969213 - 2¹³ = 664996961021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664996969223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332498484606 + 332498484607.

It is an arithmetic number, because the mean of its divisors is an integer number (332498484607).

Almost surely, 2^664996969213 is an apocalyptic number.

It is an amenable number.

664996969213 is a deficient number, since it is larger than the sum of its proper divisors (1).

664996969213 is an equidigital number, since it uses as much as digits as its factorization.

664996969213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204073344, while the sum is 70.

The spelling of 664996969213 in words is "six hundred sixty-four billion, nine hundred ninety-six million, nine hundred sixty-nine thousand, two hundred thirteen".