81311100111318 has 64 divisors (see below), whose sum is σ = 202757585038848. Its totient is φ = 21118950750720.

The previous prime is 81311100111299. The next prime is 81311100111323.

81311100111318 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×81311100111318² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8625646 + ... + 15395582.

It is an arithmetic number, because the mean of its divisors is an integer number (3168087266232).

Almost surely, 2^{81311100111318} is an apocalyptic number.

81311100111318 is an abundant number, since it is smaller than the sum of its proper divisors (121446484927530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81311100111318 is a wasteful number, since it uses less digits than its factorization.

81311100111318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6795957.

The product of its (nonzero) digits is 576, while the sum is 30.

It can be divided in two parts, 81311100 and 111318, that added together give a palindrome (81422418).

The spelling of 81311100111318 in words is "eighty-one trillion, three hundred eleven billion, one hundred million, one hundred eleven thousand, three hundred eighteen".