82115215871 has 16 divisors (see below), whose sum is σ = 92810079936. Its totient is φ = 72083928576.

The previous prime is 82115215867. The next prime is 82115215907. The reversal of 82115215871 is 17851251128.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 82115215871 - 2² = 82115215867 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82115215801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 742010 + ... + 845463.

It is an arithmetic number, because the mean of its divisors is an integer number (5800629996).

Almost surely, 2^82115215871 is an apocalyptic number.

82115215871 is a deficient number, since it is larger than the sum of its proper divisors (10694864065).

82115215871 is a wasteful number, since it uses less digits than its factorization.

82115215871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1587682.

The product of its digits is 44800, while the sum is 41.

Adding to 82115215871 its reverse (17851251128), we get a palindrome (99966466999).

The spelling of 82115215871 in words is "eighty-two billion, one hundred fifteen million, two hundred fifteen thousand, eight hundred seventy-one".