668204617 has 8 divisors (see below), whose sum is σ = 671329800. Its totient is φ = 665086464.

The previous prime is 668204609. The next prime is 668204627. The reversal of 668204617 is 716402866.

It can be written as a sum of positive squares in 4 ways, for example, as 149230656 + 518973961 = 12216^2 + 22781^2 .

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 668204617 - 2³ = 668204609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 668204617.

It is not an unprimeable number, because it can be changed into a prime (668204627) 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, 293359 + ... + 295627.

It is an arithmetic number, because the mean of its divisors is an integer number (83916225).

Almost surely, 2^668204617 is an apocalyptic number.

It is an amenable number.

668204617 is a deficient number, since it is larger than the sum of its proper divisors (3125183).

668204617 is a wasteful number, since it uses less digits than its factorization.

668204617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3515.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 668204617 is about 25849.6540982660. The cubic root of 668204617 is about 874.2517105127.

The spelling of 668204617 in words is "six hundred sixty-eight million, two hundred four thousand, six hundred seventeen".