81117271118 has 32 divisors (see below), whose sum is σ = 133738305120. Its totient is φ = 36671126400.

The previous prime is 81117271093. The next prime is 81117271163.

It is a happy number.

81117271118 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×81117271118² (a number of 23 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 15 ways as a sum of consecutive naturals, for example, 329468 + ... + 520368.

It is an arithmetic number, because the mean of its divisors is an integer number (4179322035).

Almost surely, 2^81117271118 is an apocalyptic number.

81117271118 is a deficient number, since it is larger than the sum of its proper divisors (52621034002).

81117271118 is a wasteful number, since it uses less digits than its factorization.

81117271118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191252.

The product of its digits is 6272, while the sum is 38.

The spelling of 81117271118 in words is "eighty-one billion, one hundred seventeen million, two hundred seventy-one thousand, one hundred eighteen".