668171866 has 8 divisors (see below), whose sum is σ = 1002445920. Its totient is φ = 334023228.

The previous prime is 668171837. The next prime is 668171891.

668171866 is nontrivially palindromic in base 10.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16656 + ... + 40171.

It is an arithmetic number, because the mean of its divisors is an integer number (125305740).

Almost surely, 2^668171866 is an apocalyptic number.

668171866 is a deficient number, since it is larger than the sum of its proper divisors (334274054).

668171866 is a wasteful number, since it uses less digits than its factorization.

668171866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62708.

The product of its digits is 580608, while the sum is 49.

The square root of 668171866 is about 25849.0206004019. The cubic root of 668171866 is about 874.2374269211.

The spelling of 668171866 in words is "six hundred sixty-eight million, one hundred seventy-one thousand, eight hundred sixty-six".