81344044318 has 4 divisors (see below), whose sum is σ = 122016066480. Its totient is φ = 40672022158.

The previous prime is 81344044273. The next prime is 81344044337.

81344044318 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20336011078 + ... + 20336011081.

It is an arithmetic number, because the mean of its divisors is an integer number (30504016620).

Almost surely, 2^81344044318 is an apocalyptic number.

81344044318 is a deficient number, since it is larger than the sum of its proper divisors (40672022162).

81344044318 is a wasteful number, since it uses less digits than its factorization.

81344044318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40672022161.

The product of its (nonzero) digits is 147456, while the sum is 40.

It can be divided in two parts, 813440 and 44318, that added together give a palindrome (857758).

The spelling of 81344044318 in words is "eighty-one billion, three hundred forty-four million, forty-four thousand, three hundred eighteen".