81159495118 has 16 divisors (see below), whose sum is σ = 131117792400. Its totient is φ = 37454230656.

The previous prime is 81159495113. The next prime is 81159495187.

81159495118 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 (81159495113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89121 + ... + 412627.

It is an arithmetic number, because the mean of its divisors is an integer number (8194862025).

Almost surely, 2^81159495118 is an apocalyptic number.

81159495118 is a deficient number, since it is larger than the sum of its proper divisors (49958297282).

81159495118 is a wasteful number, since it uses less digits than its factorization.

81159495118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333171.

The product of its digits is 518400, while the sum is 52.

The spelling of 81159495118 in words is "eighty-one billion, one hundred fifty-nine million, four hundred ninety-five thousand, one hundred eighteen".