668272718 has 8 divisors (see below), whose sum is σ = 1025721048. Its totient is φ = 326365704.

The previous prime is 668272699. The next prime is 668272747. The reversal of 668272718 is 817272866.

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

It is a Curzon number.

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, 3885221 + ... + 3885392.

It is an arithmetic number, because the mean of its divisors is an integer number (128215131).

Almost surely, 2^668272718 is an apocalyptic number.

668272718 is a deficient number, since it is larger than the sum of its proper divisors (357448330).

668272718 is a wasteful number, since it uses less digits than its factorization.

668272718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7770658.

The product of its digits is 451584, while the sum is 47.

The square root of 668272718 is about 25850.9713163742. The cubic root of 668272718 is about 874.2814096956.

The spelling of 668272718 in words is "six hundred sixty-eight million, two hundred seventy-two thousand, seven hundred eighteen".