82867867581 has 4 divisors (see below), whose sum is σ = 110490490112. Its totient is φ = 55245245052.

The previous prime is 82867867567. The next prime is 82867867619. The reversal of 82867867581 is 18576876828.

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 a de Polignac number, because none of the positive numbers 2^k-82867867581 is a prime.

It is a super-2 number, since 2×82867867581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82867867081) 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, 13811311261 + ... + 13811311266.

It is an arithmetic number, because the mean of its divisors is an integer number (27622622528).

Almost surely, 2^82867867581 is an apocalyptic number.

It is an amenable number.

82867867581 is a deficient number, since it is larger than the sum of its proper divisors (27622622531).

82867867581 is a wasteful number, since it uses less digits than its factorization.

82867867581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27622622530.

The product of its digits is 72253440, while the sum is 66.

The spelling of 82867867581 in words is "eighty-two billion, eight hundred sixty-seven million, eight hundred sixty-seven thousand, five hundred eighty-one".