2566218865 has 32 divisors (see below), whose sum is σ = 3587742720. Its totient is φ = 1725662400.

The previous prime is 2566218841. The next prime is 2566218911. The reversal of 2566218865 is 5688126652.

2566218865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2566218865 - 2⁷ = 2566218737 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1012650 + ... + 1015180.

It is an arithmetic number, because the mean of its divisors is an integer number (112116960).

Almost surely, 2^2566218865 is an apocalyptic number.

It is an amenable number.

2566218865 is a deficient number, since it is larger than the sum of its proper divisors (1021523855).

2566218865 is a wasteful number, since it uses less digits than its factorization.

2566218865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3093.

The product of its digits is 1382400, while the sum is 49.

The square root of 2566218865 is about 50657.8608411370. The cubic root of 2566218865 is about 1369.0875813225.

The spelling of 2566218865 in words is "two billion, five hundred sixty-six million, two hundred eighteen thousand, eight hundred sixty-five".