668606885 has 8 divisors (see below), whose sum is σ = 821897496. Its totient is φ = 521839360.

The previous prime is 668606879. The next prime is 668606899. The reversal of 668606885 is 588606866.

668606885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 19070689 + 649536196 = 4367^2 + 25486^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-668606885 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1630544 + ... + 1630953.

It is an arithmetic number, because the mean of its divisors is an integer number (102737187).

Almost surely, 2^668606885 is an apocalyptic number.

It is an amenable number.

668606885 is a deficient number, since it is larger than the sum of its proper divisors (153290611).

668606885 is a wasteful number, since it uses less digits than its factorization.

668606885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3261543.

The product of its (nonzero) digits is 3317760, while the sum is 53.

The square root of 668606885 is about 25857.4338440612. The cubic root of 668606885 is about 874.4271123428.

The spelling of 668606885 in words is "six hundred sixty-eight million, six hundred six thousand, eight hundred eighty-five".