81100000118 has 4 divisors (see below), whose sum is σ = 121650000180. Its totient is φ = 40550000058.

The previous prime is 81100000117. The next prime is 81100000127.

81100000118 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

81100000118 is a strobogrammatic number because it is the same when read upside-down.

It is a self number, because there is not a number n which added to its sum of digits gives 81100000118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81100000117) 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 as a sum of consecutive naturals, namely, 20275000028 + ... + 20275000031.

It is an arithmetic number, because the mean of its divisors is an integer number (30412500045).

Almost surely, 2^81100000118 is an apocalyptic number.

81100000118 is a deficient number, since it is larger than the sum of its proper divisors (40550000062).

81100000118 is a wasteful number, since it uses less digits than its factorization.

81100000118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40550000061.

The product of its (nonzero) digits is 64, while the sum is 20.

It can be divided in two parts, 81100000 and 118, that added together give a palindrome (81100118).

The spelling of 81100000118 in words is "eighty-one billion, one hundred million, one hundred eighteen", and thus it is an aban number.