82856623681 has 4 divisors (see below), whose sum is σ = 89230210132. Its totient is φ = 76483037232.

The previous prime is 82856623679. The next prime is 82856623721. The reversal of 82856623681 is 18632665828.

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 17382049281 + 65474574400 = 131841^2 + 255880^2 .

It is a cyclic number.

It is not a de Polignac number, because 82856623681 - 2¹ = 82856623679 is a prime.

It is a super-2 number, since 2×82856623681² (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 (82856623181) 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, 3186793206 + ... + 3186793231.

It is an arithmetic number, because the mean of its divisors is an integer number (22307552533).

Almost surely, 2^82856623681 is an apocalyptic number.

It is an amenable number.

82856623681 is a deficient number, since it is larger than the sum of its proper divisors (6373586451).

82856623681 is a wasteful number, since it uses less digits than its factorization.

82856623681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6373586450.

The product of its digits is 6635520, while the sum is 55.

The spelling of 82856623681 in words is "eighty-two billion, eight hundred fifty-six million, six hundred twenty-three thousand, six hundred eighty-one".