81385118367 has 24 divisors (see below), whose sum is σ = 129308769072. Its totient is φ = 45371491200.

The previous prime is 81385118359. The next prime is 81385118387. The reversal of 81385118367 is 76381158318.

It is not a de Polignac number, because 81385118367 - 2³ = 81385118359 is a prime.

It is a super-2 number, since 2×81385118367² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81385118327) 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 in 23 ways as a sum of consecutive naturals, for example, 6745684 + ... + 6757737.

It is an arithmetic number, because the mean of its divisors is an integer number (5387865378).

Almost surely, 2^81385118367 is an apocalyptic number.

81385118367 is a deficient number, since it is larger than the sum of its proper divisors (47923650705).

81385118367 is a wasteful number, since it uses less digits than its factorization.

81385118367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13503479 (or 13503472 counting only the distinct ones).

The product of its digits is 967680, while the sum is 51.

The spelling of 81385118367 in words is "eighty-one billion, three hundred eighty-five million, one hundred eighteen thousand, three hundred sixty-seven".