668988245 has 8 divisors (see below), whose sum is σ = 803002200. Its totient is φ = 535046400.

The previous prime is 668988227. The next prime is 668988253. The reversal of 668988245 is 542889866.

It can be written as a sum of positive squares in 4 ways, for example, as 1747684 + 667240561 = 1322^2 + 25831^2 .

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

It is not a de Polignac number, because 668988245 - 2¹⁸ = 668726101 is a prime.

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, 5081 + ... + 36929.

It is an arithmetic number, because the mean of its divisors is an integer number (100375275).

Almost surely, 2^668988245 is an apocalyptic number.

It is an amenable number.

668988245 is a deficient number, since it is larger than the sum of its proper divisors (134013955).

668988245 is a wasteful number, since it uses less digits than its factorization.

668988245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36055.

The product of its digits is 6635520, while the sum is 56.

The square root of 668988245 is about 25864.8070744786. The cubic root of 668988245 is about 874.5933326581.

The spelling of 668988245 in words is "six hundred sixty-eight million, nine hundred eighty-eight thousand, two hundred forty-five".