81044444018 has 16 divisors (see below), whose sum is σ = 122685415776. Its totient is φ = 40150269120.

The previous prime is 81044444011. The next prime is 81044444027.

81044444018 is nontrivially palindromic in base 10.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81044444011) 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 7 ways as a sum of consecutive naturals, for example, 72071 + ... + 409002.

It is an arithmetic number, because the mean of its divisors is an integer number (7667838486).

Almost surely, 2^81044444018 is an apocalyptic number.

81044444018 is a deficient number, since it is larger than the sum of its proper divisors (41640971758).

81044444018 is a wasteful number, since it uses less digits than its factorization.

81044444018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481849.

The product of its (nonzero) digits is 65536, while the sum is 38.

The spelling of 81044444018 in words is "eighty-one billion, forty-four million, four hundred forty-four thousand, eighteen".