6640011305 has 8 divisors (see below), whose sum is σ = 8183365512. Its totient is φ = 5168441088.

The previous prime is 6640011239. The next prime is 6640011319. The reversal of 6640011305 is 5031100466.

6640011305 is digitally balanced in base 3, 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 2021041936 + 4618969369 = 44956^2 + 67963^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 6640011305 - 2¹⁰ = 6640010281 is a prime.

It is a Duffinian 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, 17945792 + ... + 17946161.

It is an arithmetic number, because the mean of its divisors is an integer number (1022920689).

Almost surely, 2^6640011305 is an apocalyptic number.

It is an amenable number.

6640011305 is a deficient number, since it is larger than the sum of its proper divisors (1543354207).

6640011305 is a wasteful number, since it uses less digits than its factorization.

6640011305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35891995.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 6640011305 is about 81486.2645174019. The cubic root of 6640011305 is about 1879.5603416776.

The spelling of 6640011305 in words is "six billion, six hundred forty million, eleven thousand, three hundred five".