82140173891 has 2 divisors, whose sum is σ = 82140173892. Its totient is φ = 82140173890.

The previous prime is 82140173813. The next prime is 82140173903. The reversal of 82140173891 is 19837104128.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82140173891 - 2¹⁸ = 82139911747 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (82140176891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41070086945 + 41070086946.

It is an arithmetic number, because the mean of its divisors is an integer number (41070086946).

Almost surely, 2^82140173891 is an apocalyptic number.

82140173891 is a deficient number, since it is larger than the sum of its proper divisors (1).

82140173891 is an equidigital number, since it uses as much as digits as its factorization.

82140173891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 44.

The spelling of 82140173891 in words is "eighty-two billion, one hundred forty million, one hundred seventy-three thousand, eight hundred ninety-one".