81097198044 has 24 divisors (see below), whose sum is σ = 190053119760. Its totient is φ = 26914353024.

The previous prime is 81097197989. The next prime is 81097198121. The reversal of 81097198044 is 44089179018.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 14752929 + ... + 14758424.

It is an arithmetic number, because the mean of its divisors is an integer number (7918879990).

Almost surely, 2^81097198044 is an apocalyptic number.

It is an amenable number.

81097198044 is an abundant number, since it is smaller than the sum of its proper divisors (108955921716).

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

81097198044 is a wasteful number, since it uses less digits than its factorization.

81097198044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29511589 (or 29511587 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 51.

The spelling of 81097198044 in words is "eighty-one billion, ninety-seven million, one hundred ninety-eight thousand, forty-four".