6640243245 has 64 divisors (see below), whose sum is σ = 12606105600. Its totient is φ = 3308981760.

The previous prime is 6640243213. The next prime is 6640243261. The reversal of 6640243245 is 5423420466.

6640243245 is a `hidden beast` number, since 6 + 6 + 402 + 4 + 3 + 245 = 666.

It is not a de Polignac number, because 6640243245 - 2⁵ = 6640243213 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 94009 + ... + 148721.

It is an arithmetic number, because the mean of its divisors is an integer number (196970400).

Almost surely, 2^6640243245 is an apocalyptic number.

It is an amenable number.

6640243245 is a deficient number, since it is larger than the sum of its proper divisors (5965862355).

6640243245 is a wasteful number, since it uses less digits than its factorization.

6640243245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54787 (or 54781 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

The square root of 6640243245 is about 81487.6876896136. The cubic root of 6640243245 is about 1879.5822261860.

The spelling of 6640243245 in words is "six billion, six hundred forty million, two hundred forty-three thousand, two hundred forty-five".