664568269 has 2 divisors, whose sum is σ = 664568270. Its totient is φ = 664568268.

The previous prime is 664568237. The next prime is 664568293. The reversal of 664568269 is 962865466.

664568269 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 530703369 + 133864900 = 23037^2 + 11570^2 .

It is a cyclic number.

It is not a de Polignac number, because 664568269 - 2⁵ = 664568237 is a prime.

It is a super-2 number, since 2×664568269² = 883301968323312722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664568209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332284134 + 332284135.

It is an arithmetic number, because the mean of its divisors is an integer number (332284135).

Almost surely, 2^664568269 is an apocalyptic number.

It is an amenable number.

664568269 is a deficient number, since it is larger than the sum of its proper divisors (1).

664568269 is an equidigital number, since it uses as much as digits as its factorization.

664568269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3732480, while the sum is 52.

The square root of 664568269 is about 25779.2216523308. The cubic root of 664568269 is about 872.6629417935.

The spelling of 664568269 in words is "six hundred sixty-four million, five hundred sixty-eight thousand, two hundred sixty-nine".