668319839 has 16 divisors (see below), whose sum is σ = 737509536. Its totient is φ = 600576000.

The previous prime is 668319829. The next prime is 668319857. The reversal of 668319839 is 938913866.

It is a cyclic number.

It is not a de Polignac number, because 668319839 - 2²⁸ = 399884383 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 (668319829) 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, 416639 + ... + 418239.

It is an arithmetic number, because the mean of its divisors is an integer number (46094346).

Almost surely, 2^668319839 is an apocalyptic number.

668319839 is a deficient number, since it is larger than the sum of its proper divisors (69189697).

668319839 is a wasteful number, since it uses less digits than its factorization.

668319839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2026.

The product of its digits is 1679616, while the sum is 53.

The square root of 668319839 is about 25851.8826973975. The cubic root of 668319839 is about 874.3019582156.

The spelling of 668319839 in words is "six hundred sixty-eight million, three hundred nineteen thousand, eight hundred thirty-nine".