81518854418 has 8 divisors (see below), whose sum is σ = 128713980720. Its totient is φ = 38614194180.

The previous prime is 81518854411. The next prime is 81518854537. The reversal of 81518854418 is 81445881518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 81518854418.

It is not an unprimeable number, because it can be changed into a prime (81518854411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1072616468 + ... + 1072616543.

It is an arithmetic number, because the mean of its divisors is an integer number (16089247590).

Almost surely, 2^81518854418 is an apocalyptic number.

81518854418 is a deficient number, since it is larger than the sum of its proper divisors (47195126302).

81518854418 is a wasteful number, since it uses less digits than its factorization.

81518854418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2145233032.

The product of its digits is 1638400, while the sum is 53.

The spelling of 81518854418 in words is "eighty-one billion, five hundred eighteen million, eight hundred fifty-four thousand, four hundred eighteen".