668910985 has 16 divisors (see below), whose sum is σ = 855017856. Its totient is φ = 500624128.

The previous prime is 668910973. The next prime is 668911037. The reversal of 668910985 is 589019866.

It is a cyclic number.

It is not a de Polignac number, because 668910985 - 2¹¹ = 668908937 is a prime.

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, 9367 + ... + 37756.

It is an arithmetic number, because the mean of its divisors is an integer number (53438616).

Almost surely, 2^668910985 is an apocalyptic number.

It is an amenable number.

668910985 is a deficient number, since it is larger than the sum of its proper divisors (186106871).

668910985 is a wasteful number, since it uses less digits than its factorization.

668910985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47312.

The product of its (nonzero) digits is 933120, while the sum is 52.

The square root of 668910985 is about 25863.3134961474. The cubic root of 668910985 is about 874.5596630669.

The spelling of 668910985 in words is "six hundred sixty-eight million, nine hundred ten thousand, nine hundred eighty-five".