81385118327 has 2 divisors, whose sum is σ = 81385118328. Its totient is φ = 81385118326.

The previous prime is 81385118303. The next prime is 81385118329. The reversal of 81385118327 is 72381158318.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81385118327 - 2¹² = 81385114231 is a prime.

Together with 81385118329, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81385118329) 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, 40692559163 + 40692559164.

It is an arithmetic number, because the mean of its divisors is an integer number (40692559164).

Almost surely, 2^81385118327 is an apocalyptic number.

81385118327 is a deficient number, since it is larger than the sum of its proper divisors (1).

81385118327 is an equidigital number, since it uses as much as digits as its factorization.

81385118327 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 47.

The spelling of 81385118327 in words is "eighty-one billion, three hundred eighty-five million, one hundred eighteen thousand, three hundred twenty-seven".