865528240085 has 4 divisors (see below), whose sum is σ = 1038633888108. Its totient is φ = 692422592064.

The previous prime is 865528240051. The next prime is 865528240127. The reversal of 865528240085 is 580042825568.

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 396848341681 + 468679898404 = 629959^2 + 684602^2 .

It is a cyclic number.

It is not a de Polignac number, because 865528240085 - 2²⁴ = 865511462869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86552824004 + ... + 86552824013.

It is an arithmetic number, because the mean of its divisors is an integer number (259658472027).

Almost surely, 2^865528240085 is an apocalyptic number.

It is an amenable number.

865528240085 is a deficient number, since it is larger than the sum of its proper divisors (173105648023).

865528240085 is a wasteful number, since it uses less digits than its factorization.

865528240085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173105648022.

The product of its (nonzero) digits is 6144000, while the sum is 53.

The spelling of 865528240085 in words is "eight hundred sixty-five billion, five hundred twenty-eight million, two hundred forty thousand, eighty-five".