2568681817 has 4 divisors (see below), whose sum is σ = 2766272740. Its totient is φ = 2371090896.

The previous prime is 2568681769. The next prime is 2568681853. The reversal of 2568681817 is 7181868652.

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 960752016 + 1607929801 = 30996^2 + 40099^2 .

It is a cyclic number.

It is not a de Polignac number, because 2568681817 - 2¹⁵ = 2568649049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2568681617) by changing a digit.

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, 98795442 + ... + 98795467.

It is an arithmetic number, because the mean of its divisors is an integer number (691568185).

Almost surely, 2^2568681817 is an apocalyptic number.

It is an amenable number.

2568681817 is a deficient number, since it is larger than the sum of its proper divisors (197590923).

2568681817 is a wasteful number, since it uses less digits than its factorization.

2568681817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197590922.

The product of its digits is 1290240, while the sum is 52.

The square root of 2568681817 is about 50682.1646834466. The cubic root of 2568681817 is about 1369.5254393775.

The spelling of 2568681817 in words is "two billion, five hundred sixty-eight million, six hundred eighty-one thousand, eight hundred seventeen".