81040415118 has 64 divisors (see below), whose sum is σ = 177290830080. Its totient is φ = 24546246912.

The previous prime is 81040415111. The next prime is 81040415147. The reversal of 81040415118 is 81151404018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81040415111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1550121 + ... + 1601547.

It is an arithmetic number, because the mean of its divisors is an integer number (2770169220).

Almost surely, 2^81040415118 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81040415118, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88645415040).

81040415118 is an abundant number, since it is smaller than the sum of its proper divisors (96250414962).

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

81040415118 is a wasteful number, since it uses less digits than its factorization.

81040415118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51761.

The product of its (nonzero) digits is 5120, while the sum is 33.

The spelling of 81040415118 in words is "eighty-one billion, forty million, four hundred fifteen thousand, one hundred eighteen".