82195811917 has 4 divisors (see below), whose sum is σ = 82196696736. Its totient is φ = 82194927100.

The previous prime is 82195811879. The next prime is 82195811959. The reversal of 82195811917 is 71911859128.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 82195811917 - 2¹¹ = 82195809869 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 (82195811977) 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, 284209 + ... + 495142.

It is an arithmetic number, because the mean of its divisors is an integer number (20549174184).

Almost surely, 2^82195811917 is an apocalyptic number.

It is an amenable number.

82195811917 is a deficient number, since it is larger than the sum of its proper divisors (884819).

82195811917 is a wasteful number, since it uses less digits than its factorization.

82195811917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884818.

The product of its digits is 362880, while the sum is 52.

The spelling of 82195811917 in words is "eighty-two billion, one hundred ninety-five million, eight hundred eleven thousand, nine hundred seventeen".