82945843681 has 4 divisors (see below), whose sum is σ = 82978748164. Its totient is φ = 82912939200.

The previous prime is 82945843627. The next prime is 82945843693. The reversal of 82945843681 is 18634854928.

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 39170743056 + 43775100625 = 197916^2 + 209225^2 .

It is a cyclic number.

It is not a de Polignac number, because 82945843681 - 2¹¹ = 82945841633 is a prime.

It is a super-2 number, since 2×82945843681² (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 (82945843381) 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, 16448460 + ... + 16453501.

It is an arithmetic number, because the mean of its divisors is an integer number (20744687041).

Almost surely, 2^82945843681 is an apocalyptic number.

It is an amenable number.

82945843681 is a deficient number, since it is larger than the sum of its proper divisors (32904483).

82945843681 is a wasteful number, since it uses less digits than its factorization.

82945843681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32904482.

The product of its digits is 13271040, while the sum is 58.

The spelling of 82945843681 in words is "eighty-two billion, nine hundred forty-five million, eight hundred forty-three thousand, six hundred eighty-one".