82716870809 has 4 divisors (see below), whose sum is σ = 83024368740. Its totient is φ = 82409372880.

The previous prime is 82716870793. The next prime is 82716870911. The reversal of 82716870809 is 90807861728.

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 23751433225 + 58965437584 = 154115^2 + 242828^2 .

It is a cyclic number.

It is not a de Polignac number, because 82716870809 - 2⁴ = 82716870793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82716870109) 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, 153748562 + ... + 153749099.

It is an arithmetic number, because the mean of its divisors is an integer number (20756092185).

Almost surely, 2^82716870809 is an apocalyptic number.

It is an amenable number.

82716870809 is a deficient number, since it is larger than the sum of its proper divisors (307497931).

82716870809 is a wasteful number, since it uses less digits than its factorization.

82716870809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307497930.

The product of its (nonzero) digits is 2709504, while the sum is 56.

The spelling of 82716870809 in words is "eighty-two billion, seven hundred sixteen million, eight hundred seventy thousand, eight hundred nine".