81116811861118 has 8 divisors (see below), whose sum is σ = 132736601227320. Its totient is φ = 36871278118680.

The previous prime is 81116811861101. The next prime is 81116811861199.

81116811861118 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1843563905913 + ... + 1843563905956.

It is an arithmetic number, because the mean of its divisors is an integer number (16592075153415).

Almost surely, 2^{81116811861118} is an apocalyptic number.

81116811861118 is a deficient number, since it is larger than the sum of its proper divisors (51619789366202).

81116811861118 is a wasteful number, since it uses less digits than its factorization.

81116811861118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3687127811882.

The product of its digits is 147456, while the sum is 52.

It can be divided in two parts, 8111681 and 1861118, that added together give a palindrome (9972799).

The spelling of 81116811861118 in words is "eighty-one trillion, one hundred sixteen billion, eight hundred eleven million, eight hundred sixty-one thousand, one hundred eighteen".