668919766 has 8 divisors (see below), whose sum is σ = 1003704624. Its totient is φ = 334351560.

The previous prime is 668919737. The next prime is 668919773. The reversal of 668919766 is 667919866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 668919766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46210 + ... + 58933.

It is an arithmetic number, because the mean of its divisors is an integer number (125463078).

Almost surely, 2^668919766 is an apocalyptic number.

668919766 is a deficient number, since it is larger than the sum of its proper divisors (334784858).

668919766 is a wasteful number, since it uses less digits than its factorization.

668919766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108326.

The product of its digits is 5878656, while the sum is 58.

The square root of 668919766 is about 25863.4832534212. The cubic root of 668919766 is about 874.5634899213.

The spelling of 668919766 in words is "six hundred sixty-eight million, nine hundred nineteen thousand, seven hundred sixty-six".