82864869805 has 4 divisors (see below), whose sum is σ = 99437843772. Its totient is φ = 66291895840.

The previous prime is 82864869781. The next prime is 82864869811. The reversal of 82864869805 is 50896846828.

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 47476487881 + 35388381924 = 217891^2 + 188118^2 .

It is not a de Polignac number, because 82864869805 - 2²¹ = 82862772653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 8286486976 + ... + 8286486985.

It is an arithmetic number, because the mean of its divisors is an integer number (24859460943).

Almost surely, 2^82864869805 is an apocalyptic number.

It is an amenable number.

82864869805 is a deficient number, since it is larger than the sum of its proper divisors (16572973967).

82864869805 is a wasteful number, since it uses less digits than its factorization.

82864869805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16572973966.

The product of its (nonzero) digits is 53084160, while the sum is 64.

The spelling of 82864869805 in words is "eighty-two billion, eight hundred sixty-four million, eight hundred sixty-nine thousand, eight hundred five".