664735469 has 2 divisors, whose sum is σ = 664735470. Its totient is φ = 664735468.

The previous prime is 664735457. The next prime is 664735493. The reversal of 664735469 is 964537466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 521574244 + 143161225 = 22838^2 + 11965^2 .

It is a cyclic number.

It is not a de Polignac number, because 664735469 - 2⁴ = 664735453 is a prime.

It is a super-2 number, since 2×664735469² = 883746487493299922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664735499) 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, 332367734 + 332367735.

It is an arithmetic number, because the mean of its divisors is an integer number (332367735).

Almost surely, 2^664735469 is an apocalyptic number.

It is an amenable number.

664735469 is a deficient number, since it is larger than the sum of its proper divisors (1).

664735469 is an equidigital number, since it uses as much as digits as its factorization.

664735469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 50.

The square root of 664735469 is about 25782.4643701877. The cubic root of 664735469 is about 872.7361206355.

The spelling of 664735469 in words is "six hundred sixty-four million, seven hundred thirty-five thousand, four hundred sixty-nine".