668666174 has 32 divisors (see below), whose sum is σ = 1105418880. Its totient is φ = 300837600.

The previous prime is 668666161. The next prime is 668666197. The reversal of 668666174 is 471666866.

It is a happy number.

It is a super-2 number, since 2×668666174² = 894228904503596552, 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 15 ways as a sum of consecutive naturals, for example, 1313432 + ... + 1313940.

It is an arithmetic number, because the mean of its divisors is an integer number (34544340).

Almost surely, 2^668666174 is an apocalyptic number.

668666174 is a deficient number, since it is larger than the sum of its proper divisors (436752706).

668666174 is a wasteful number, since it uses less digits than its factorization.

668666174 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016.

The product of its digits is 1741824, while the sum is 50.

The square root of 668666174 is about 25858.5802781205. The cubic root of 668666174 is about 874.4529583109.

The spelling of 668666174 in words is "six hundred sixty-eight million, six hundred sixty-six thousand, one hundred seventy-four".