81111211118 has 16 divisors (see below), whose sum is σ = 139058156160. Its totient is φ = 34759356216.

The previous prime is 81111211117. The next prime is 81111211133.

81111211118 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81111211117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14996 + ... + 403047.

It is an arithmetic number, because the mean of its divisors is an integer number (8691134760).

Almost surely, 2^81111211118 is an apocalyptic number.

81111211118 is a deficient number, since it is larger than the sum of its proper divisors (57946945042).

81111211118 is a wasteful number, since it uses less digits than its factorization.

81111211118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431911.

The product of its digits is 128, while the sum is 26.

The spelling of 81111211118 in words is "eighty-one billion, one hundred eleven million, two hundred eleven thousand, one hundred eighteen".