82171716499 has 4 divisors (see below), whose sum is σ = 82314129064. Its totient is φ = 82029303936.

The previous prime is 82171716491. The next prime is 82171716541. The reversal of 82171716499 is 99461717128.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 82171716499 - 2³ = 82171716491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82171716491) by changing a digit.

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, 71205417 + ... + 71206570.

It is an arithmetic number, because the mean of its divisors is an integer number (20578532266).

Almost surely, 2^82171716499 is an apocalyptic number.

82171716499 is a deficient number, since it is larger than the sum of its proper divisors (142412565).

82171716499 is a wasteful number, since it uses less digits than its factorization.

82171716499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142412564.

The product of its digits is 1524096, while the sum is 55.

The spelling of 82171716499 in words is "eighty-two billion, one hundred seventy-one million, seven hundred sixteen thousand, four hundred ninety-nine".