865720522313 has 4 divisors (see below), whose sum is σ = 865726764420. Its totient is φ = 865714280208.

The previous prime is 865720522297. The next prime is 865720522327. The reversal of 865720522313 is 313225027568.

It is a happy number.

865720522313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 155009138944 + 710711383369 = 393712^2 + 843037^2 .

It is a cyclic number.

It is not a de Polignac number, because 865720522313 - 2⁴ = 865720522297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (865720522343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2908178 + ... + 3192011.

It is an arithmetic number, because the mean of its divisors is an integer number (216431691105).

Almost surely, 2^865720522313 is an apocalyptic number.

It is an amenable number.

865720522313 is a deficient number, since it is larger than the sum of its proper divisors (6242107).

865720522313 is a wasteful number, since it uses less digits than its factorization.

865720522313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6242106.

The product of its (nonzero) digits is 604800, while the sum is 44.

The spelling of 865720522313 in words is "eight hundred sixty-five billion, seven hundred twenty million, five hundred twenty-two thousand, three hundred thirteen".