856323317181 has 4 divisors (see below), whose sum is σ = 1141764422912. Its totient is φ = 570882211452.

The previous prime is 856323317131. The next prime is 856323317191. The reversal of 856323317181 is 181713323658.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 856323317181 - 2¹⁰ = 856323316157 is a prime.

It is a super-2 number, since 2×856323317181² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 856323317181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856323317131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142720552861 + ... + 142720552866.

It is an arithmetic number, because the mean of its divisors is an integer number (285441105728).

Almost surely, 2^856323317181 is an apocalyptic number.

It is an amenable number.

856323317181 is a deficient number, since it is larger than the sum of its proper divisors (285441105731).

856323317181 is a wasteful number, since it uses less digits than its factorization.

856323317181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285441105730.

The product of its digits is 725760, while the sum is 48.

The spelling of 856323317181 in words is "eight hundred fifty-six billion, three hundred twenty-three million, three hundred seventeen thousand, one hundred eighty-one".