668318959 has 16 divisors (see below), whose sum is σ = 834647040. Its totient is φ = 519881760.

The previous prime is 668318957. The next prime is 668319059. The reversal of 668318959 is 959813866.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 668318959 - 2¹ = 668318957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668318957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40122 + ... + 54280.

It is an arithmetic number, because the mean of its divisors is an integer number (52165440).

Almost surely, 2^668318959 is an apocalyptic number.

668318959 is a deficient number, since it is larger than the sum of its proper divisors (166328081).

668318959 is a wasteful number, since it uses less digits than its factorization.

668318959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14790.

The product of its digits is 2799360, while the sum is 55.

The square root of 668318959 is about 25851.8656773549. The cubic root of 668318959 is about 874.3015744742.

The spelling of 668318959 in words is "six hundred sixty-eight million, three hundred eighteen thousand, nine hundred fifty-nine".