6663245305 has 4 divisors (see below), whose sum is σ = 7995894372. Its totient is φ = 5330596240.

The previous prime is 6663245293. The next prime is 6663245311. The reversal of 6663245305 is 5035423666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2425365504 + 4237879801 = 49248^2 + 65099^2 .

It is not a de Polignac number, because 6663245305 - 2⁵ = 6663245273 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 666324526 + ... + 666324535.

It is an arithmetic number, because the mean of its divisors is an integer number (1998973593).

Almost surely, 2^6663245305 is an apocalyptic number.

It is an amenable number.

6663245305 is a deficient number, since it is larger than the sum of its proper divisors (1332649067).

6663245305 is a wasteful number, since it uses less digits than its factorization.

6663245305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332649066.

The product of its (nonzero) digits is 388800, while the sum is 40.

The square root of 6663245305 is about 81628.7039282139. The cubic root of 6663245305 is about 1881.7500402092.

The spelling of 6663245305 in words is "six billion, six hundred sixty-three million, two hundred forty-five thousand, three hundred five".