664041517 has 2 divisors, whose sum is σ = 664041518. Its totient is φ = 664041516.

The previous prime is 664041509. The next prime is 664041529. The reversal of 664041517 is 715140466.

664041517 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 369369961 + 294671556 = 19219^2 + 17166^2 .

It is a cyclic number.

It is not a de Polignac number, because 664041517 - 2³ = 664041509 is a prime.

It is a super-2 number, since 2×664041517² = 881902272599322578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664041017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332020758 + 332020759.

It is an arithmetic number, because the mean of its divisors is an integer number (332020759).

Almost surely, 2^664041517 is an apocalyptic number.

It is an amenable number.

664041517 is a deficient number, since it is larger than the sum of its proper divisors (1).

664041517 is an equidigital number, since it uses as much as digits as its factorization.

664041517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 664041517 is about 25769.0030268926. The cubic root of 664041517 is about 872.4323166518.

The spelling of 664041517 in words is "six hundred sixty-four million, forty-one thousand, five hundred seventeen".