668382817 has 16 divisors (see below), whose sum is σ = 728444160. Its totient is φ = 611183232.

The previous prime is 668382787. The next prime is 668382833. The reversal of 668382817 is 718283866.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668382817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668382887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60063 + ... + 70315.

It is an arithmetic number, because the mean of its divisors is an integer number (45527760).

Almost surely, 2^668382817 is an apocalyptic number.

It is an amenable number.

668382817 is a deficient number, since it is larger than the sum of its proper divisors (60061343).

668382817 is a wasteful number, since it uses less digits than its factorization.

668382817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10392.

The product of its digits is 774144, while the sum is 49.

The square root of 668382817 is about 25853.1007231241. The cubic root of 668382817 is about 874.3294201463.

The spelling of 668382817 in words is "six hundred sixty-eight million, three hundred eighty-two thousand, eight hundred seventeen".