81116439344 has 20 divisors (see below), whose sum is σ = 158783342424. Its totient is φ = 40140092928.

The previous prime is 81116439343. The next prime is 81116439401. The reversal of 81116439344 is 44393461118.

It is a junction number, because it is equal to n+sod(n) for n = 81116439295 and 81116439304.

It is not an unprimeable number, because it can be changed into a prime (81116439343) 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, 26131322 + ... + 26134425.

Almost surely, 2^81116439344 is an apocalyptic number.

It is an amenable number.

81116439344 is a deficient number, since it is larger than the sum of its proper divisors (77666903080).

81116439344 is a wasteful number, since it uses less digits than its factorization.

81116439344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52265852 (or 52265846 counting only the distinct ones).

The product of its digits is 248832, while the sum is 44.

The spelling of 81116439344 in words is "eighty-one billion, one hundred sixteen million, four hundred thirty-nine thousand, three hundred forty-four".