81040417100 has 72 divisors (see below), whose sum is σ = 178852333968. Its totient is φ = 31867084800.

The previous prime is 81040417097. The next prime is 81040417111. The reversal of 81040417100 is 171404018.

It is a self number, because there is not a number n which added to its sum of digits gives 81040417100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2223020 + ... + 2259180.

It is an arithmetic number, because the mean of its divisors is an integer number (2484060194).

Almost surely, 2^81040417100 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81040417100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89426166984).

81040417100 is an abundant number, since it is smaller than the sum of its proper divisors (97811916868).

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

81040417100 is a wasteful number, since it uses less digits than its factorization.

81040417100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36555 (or 36548 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 26.

The spelling of 81040417100 in words is "eighty-one billion, forty million, four hundred seventeen thousand, one hundred".