668936518 has 8 divisors (see below), whose sum is σ = 1003547160. Its totient is φ = 334420800.

The previous prime is 668936497. The next prime is 668936551. The reversal of 668936518 is 815639866.

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

It is a super-2 number, since 2×668936518² = 894952130227928648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2208 + ... + 36643.

It is an arithmetic number, because the mean of its divisors is an integer number (125443395).

Almost surely, 2^668936518 is an apocalyptic number.

668936518 is a deficient number, since it is larger than the sum of its proper divisors (334610642).

668936518 is a wasteful number, since it uses less digits than its factorization.

668936518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47462.

The product of its digits is 1866240, while the sum is 52.

The square root of 668936518 is about 25863.8071056834. The cubic root of 668936518 is about 874.5707905304.

The spelling of 668936518 in words is "six hundred sixty-eight million, nine hundred thirty-six thousand, five hundred eighteen".