664355213 has 2 divisors, whose sum is σ = 664355214. Its totient is φ = 664355212.

The previous prime is 664355191. The next prime is 664355227. The reversal of 664355213 is 312553466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 510669604 + 153685609 = 22598^2 + 12397^2 .

It is a cyclic number.

It is not a de Polignac number, because 664355213 - 2²⁸ = 395919757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664355243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332177606 + 332177607.

It is an arithmetic number, because the mean of its divisors is an integer number (332177607).

Almost surely, 2^664355213 is an apocalyptic number.

It is an amenable number.

664355213 is a deficient number, since it is larger than the sum of its proper divisors (1).

664355213 is an equidigital number, since it uses as much as digits as its factorization.

664355213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 35.

The square root of 664355213 is about 25775.0890008163. The cubic root of 664355213 is about 872.5696752540.

The spelling of 664355213 in words is "six hundred sixty-four million, three hundred fifty-five thousand, two hundred thirteen".