664534817 has 8 divisors (see below), whose sum is σ = 687513600. Its totient is φ = 641652480.

The previous prime is 664534813. The next prime is 664534859. The reversal of 664534817 is 718435466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664534817 - 2² = 664534813 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664534813) 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 in 7 ways as a sum of consecutive naturals, for example, 9953 + ... + 37790.

It is an arithmetic number, because the mean of its divisors is an integer number (85939200).

Almost surely, 2^664534817 is an apocalyptic number.

It is an amenable number.

664534817 is a deficient number, since it is larger than the sum of its proper divisors (22978783).

664534817 is a wasteful number, since it uses less digits than its factorization.

664534817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48223.

The product of its digits is 483840, while the sum is 44.

The square root of 664534817 is about 25778.5728270593. The cubic root of 664534817 is about 872.6482992995.

The spelling of 664534817 in words is "six hundred sixty-four million, five hundred thirty-four thousand, eight hundred seventeen".