85800906817 has 4 divisors (see below), whose sum is σ = 85839680340. Its totient is φ = 85762133296.

The previous prime is 85800906773. The next prime is 85800906887. The reversal of 85800906817 is 71860900858.

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 71721660481 + 14079246336 = 267809^2 + 118656^2 .

It is a cyclic number.

It is not a de Polignac number, because 85800906817 - 2¹¹ = 85800904769 is a prime.

It is a super-2 number, since 2×85800906817² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85800906887) 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, 19383442 + ... + 19387867.

It is an arithmetic number, because the mean of its divisors is an integer number (21459920085).

Almost surely, 2^85800906817 is an apocalyptic number.

It is an amenable number.

85800906817 is a deficient number, since it is larger than the sum of its proper divisors (38773523).

85800906817 is a wasteful number, since it uses less digits than its factorization.

85800906817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38773522.

The product of its (nonzero) digits is 967680, while the sum is 52.

The spelling of 85800906817 in words is "eighty-five billion, eight hundred million, nine hundred six thousand, eight hundred seventeen".