82172306422847 has 2 divisors, whose sum is σ = 82172306422848. Its totient is φ = 82172306422846.

The previous prime is 82172306422741. The next prime is 82172306422897. The reversal of 82172306422847 is 74822460327128.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82172306422847 - 2¹⁰ = 82172306421823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 82172306422792 and 82172306422801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82172306422897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41086153211423 + 41086153211424.

It is an arithmetic number, because the mean of its divisors is an integer number (41086153211424).

Almost surely, 2^{82172306422847} is an apocalyptic number.

82172306422847 is a deficient number, since it is larger than the sum of its proper divisors (1).

82172306422847 is an equidigital number, since it uses as much as digits as its factorization.

82172306422847 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14450688, while the sum is 56.

The spelling of 82172306422847 in words is "eighty-two trillion, one hundred seventy-two billion, three hundred six million, four hundred twenty-two thousand, eight hundred forty-seven".