668467817 has 8 divisors (see below), whose sum is σ = 680625600. Its totient is φ = 656337744.

The previous prime is 668467783. The next prime is 668467831. The reversal of 668467817 is 718764866.

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 668467817 - 2⁶ = 668467753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668467517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45284 + ... + 58202.

It is an arithmetic number, because the mean of its divisors is an integer number (85078200).

Almost surely, 2^668467817 is an apocalyptic number.

It is an amenable number.

668467817 is a deficient number, since it is larger than the sum of its proper divisors (12157783).

668467817 is a wasteful number, since it uses less digits than its factorization.

668467817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13855.

The product of its digits is 2709504, while the sum is 53.

The square root of 668467817 is about 25854.7445742556. The cubic root of 668467817 is about 874.3664821656.

The spelling of 668467817 in words is "six hundred sixty-eight million, four hundred sixty-seven thousand, eight hundred seventeen".