81122822118 has 24 divisors (see below), whose sum is σ = 189286585488. Its totient is φ = 24960868272.

The previous prime is 81122822113. The next prime is 81122822119.

81122822118 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 (81122822113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 173339130 + ... + 173339597.

It is an arithmetic number, because the mean of its divisors is an integer number (7886941062).

Almost surely, 2^81122822118 is an apocalyptic number.

81122822118 is an abundant number, since it is smaller than the sum of its proper divisors (108163763370).

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

81122822118 is a wasteful number, since it uses less digits than its factorization.

81122822118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346678748 (or 346678745 counting only the distinct ones).

The product of its digits is 8192, while the sum is 36.

The spelling of 81122822118 in words is "eighty-one billion, one hundred twenty-two million, eight hundred twenty-two thousand, one hundred eighteen".