81104197633 has 6 divisors (see below), whose sum is σ = 83034207474. Its totient is φ = 79218051696.

The previous prime is 81104197597. The next prime is 81104197661. The reversal of 81104197633 is 33679140118.

It can be written as a sum of positive squares in only one way, i.e., 80640096784 + 464100849 = 283972^2 + 21543^2 .

It is a de Polignac number, because none of the positive numbers 2^k-81104197633 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81104197633.

It is not an unprimeable number, because it can be changed into a prime (81104197673) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21930060 + ... + 21933757.

It is an arithmetic number, because the mean of its divisors is an integer number (13839034579).

Almost surely, 2^81104197633 is an apocalyptic number.

It is an amenable number.

81104197633 is a deficient number, since it is larger than the sum of its proper divisors (1930009841).

81104197633 is an equidigital number, since it uses as much as digits as its factorization.

81104197633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43863903 (or 43863860 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 81104197633 in words is "eighty-one billion, one hundred four million, one hundred ninety-seven thousand, six hundred thirty-three".