664305263 has 2 divisors, whose sum is σ = 664305264. Its totient is φ = 664305262.

The previous prime is 664305221. The next prime is 664305269. The reversal of 664305263 is 362503466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664305263 - 2¹⁴ = 664288879 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664305269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332152631 + 332152632.

It is an arithmetic number, because the mean of its divisors is an integer number (332152632).

Almost surely, 2^664305263 is an apocalyptic number.

664305263 is a deficient number, since it is larger than the sum of its proper divisors (1).

664305263 is an equidigital number, since it uses as much as digits as its factorization.

664305263 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 35.

The square root of 664305263 is about 25774.1200237758. The cubic root of 664305263 is about 872.5478064571.

The spelling of 664305263 in words is "six hundred sixty-four million, three hundred five thousand, two hundred sixty-three".