86865985889 has 4 divisors (see below), whose sum is σ = 86988505620. Its totient is φ = 86743466160.

The previous prime is 86865985883. The next prime is 86865985897. The reversal of 86865985889 is 98858956868.

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 50756485264 + 36109500625 = 225292^2 + 190025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86865985889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (86865985883) 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, 61258802 + ... + 61260219.

It is an arithmetic number, because the mean of its divisors is an integer number (21747126405).

Almost surely, 2^86865985889 is an apocalyptic number.

It is an amenable number.

86865985889 is a deficient number, since it is larger than the sum of its proper divisors (122519731).

86865985889 is a wasteful number, since it uses less digits than its factorization.

86865985889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122519730.

The product of its digits is 2388787200, while the sum is 80.

The spelling of 86865985889 in words is "eighty-six billion, eight hundred sixty-five million, nine hundred eighty-five thousand, eight hundred eighty-nine".