81104197632 has 96 divisors (see below), whose sum is σ = 216356540400. Its totient is φ = 27018297344.

The previous prime is 81104197597. The next prime is 81104197661. The reversal of 81104197632 is 23679140118.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14183638 + ... + 14189354.

Almost surely, 2^81104197632 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 81104197632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108178270200).

81104197632 is an abundant number, since it is smaller than the sum of its proper divisors (135252342768).

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

81104197632 is a wasteful number, since it uses less digits than its factorization.

81104197632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8051 (or 8031 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 81104197632 in words is "eighty-one billion, one hundred four million, one hundred ninety-seven thousand, six hundred thirty-two".