668880799 has 16 divisors (see below), whose sum is σ = 689223744. Its totient is φ = 648921600.

The previous prime is 668880767. The next prime is 668880809. The reversal of 668880799 is 997088866.

It is a cyclic number.

It is not a de Polignac number, because 668880799 - 2⁵ = 668880767 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668820799) 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, 2543142 + ... + 2543404.

It is an arithmetic number, because the mean of its divisors is an integer number (43076484).

Almost surely, 2^668880799 is an apocalyptic number.

668880799 is a deficient number, since it is larger than the sum of its proper divisors (20342945).

668880799 is a wasteful number, since it uses less digits than its factorization.

668880799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738.

The product of its (nonzero) digits is 10450944, while the sum is 61.

The square root of 668880799 is about 25862.7299216459. The cubic root of 668880799 is about 874.5465074275.

The spelling of 668880799 in words is "six hundred sixty-eight million, eight hundred eighty thousand, seven hundred ninety-nine".