81116261118 has 12 divisors (see below), whose sum is σ = 175751899128. Its totient is φ = 27038753700.

The previous prime is 81116261117. The next prime is 81116261131.

81116261118 is a `hidden beast` number, since 8 + 1 + 1 + 1 + 626 + 11 + 18 = 666.

81116261118 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 (81116261117) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2253229458 + ... + 2253229493.

It is an arithmetic number, because the mean of its divisors is an integer number (14645991594).

Almost surely, 2^81116261118 is an apocalyptic number.

81116261118 is an abundant number, since it is smaller than the sum of its proper divisors (94635638010).

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

81116261118 is a wasteful number, since it uses less digits than its factorization.

81116261118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4506458959 (or 4506458956 counting only the distinct ones).

The product of its digits is 4608, while the sum is 36.

The spelling of 81116261118 in words is "eighty-one billion, one hundred sixteen million, two hundred sixty-one thousand, one hundred eighteen".