81856027163 has 2 divisors, whose sum is σ = 81856027164. Its totient is φ = 81856027162.

The previous prime is 81856027103. The next prime is 81856027171. The reversal of 81856027163 is 36172065818.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81856027163 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (81856027103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40928013581 + 40928013582.

It is an arithmetic number, because the mean of its divisors is an integer number (40928013582).

Almost surely, 2^81856027163 is an apocalyptic number.

81856027163 is a deficient number, since it is larger than the sum of its proper divisors (1).

81856027163 is an equidigital number, since it uses as much as digits as its factorization.

81856027163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 81856027163 in words is "eighty-one billion, eight hundred fifty-six million, twenty-seven thousand, one hundred sixty-three".