865666568 has 32 divisors (see below), whose sum is σ = 1804373760. Its totient is φ = 386648640.

The previous prime is 865666561. The next prime is 865666573.

865666568 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (865666561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131030 + ... + 137477.

It is an arithmetic number, because the mean of its divisors is an integer number (56386680).

Almost surely, 2^865666568 is an apocalyptic number.

It is an amenable number.

865666568 is an abundant number, since it is smaller than the sum of its proper divisors (938707192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

865666568 is a wasteful number, since it uses less digits than its factorization.

865666568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268557 (or 268553 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 56.

The square root of 865666568 is about 29422.2121534055. The cubic root of 865666568 is about 953.0526248482.

The spelling of 865666568 in words is "eight hundred sixty-five million, six hundred sixty-six thousand, five hundred sixty-eight".