668944158 has 8 divisors (see below), whose sum is σ = 1337888328. Its totient is φ = 222981384.

The previous prime is 668944139. The next prime is 668944193. The reversal of 668944158 is 851449866.

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

668944158 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 668944158.

It is a congruent number.

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, 55745341 + ... + 55745352.

It is an arithmetic number, because the mean of its divisors is an integer number (167236041).

Almost surely, 2^668944158 is an apocalyptic number.

668944158 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668944158 is a wasteful number, since it uses less digits than its factorization.

668944158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111490698.

The product of its digits is 1658880, while the sum is 51.

The square root of 668944158 is about 25863.9548020020. The cubic root of 668944158 is about 874.5741200419.

The spelling of 668944158 in words is "six hundred sixty-eight million, nine hundred forty-four thousand, one hundred fifty-eight".