81144444118 has 8 divisors (see below), whose sum is σ = 122084391240. Its totient is φ = 40449647040.

The previous prime is 81144444083. The next prime is 81144444119.

81144444118 is nontrivially palindromic in base 10.

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

It is a super-2 number, since 2×81144444118² (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 (81144444119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61286683 + ... + 61288006.

It is an arithmetic number, because the mean of its divisors is an integer number (15260548905).

Almost surely, 2^81144444118 is an apocalyptic number.

81144444118 is a deficient number, since it is larger than the sum of its proper divisors (40939947122).

81144444118 is a wasteful number, since it uses less digits than its factorization.

81144444118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122575022.

The product of its digits is 65536, while the sum is 40.

The spelling of 81144444118 in words is "eighty-one billion, one hundred forty-four million, four hundred forty-four thousand, one hundred eighteen".