81522288044 has 12 divisors (see below), whose sum is σ = 142837356144. Its totient is φ = 40711614864.

The previous prime is 81522288031. The next prime is 81522288047. The reversal of 81522288044 is 44088222518.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81522287986 and 81522288004.

It is not an unprimeable number, because it can be changed into a prime (81522288047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12378587 + ... + 12385170.

It is an arithmetic number, because the mean of its divisors is an integer number (11903113012).

Almost surely, 2^81522288044 is an apocalyptic number.

It is an amenable number.

81522288044 is a deficient number, since it is larger than the sum of its proper divisors (61315068100).

81522288044 is a wasteful number, since it uses less digits than its factorization.

81522288044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24764584 (or 24764582 counting only the distinct ones).

The product of its (nonzero) digits is 327680, while the sum is 44.

The spelling of 81522288044 in words is "eighty-one billion, five hundred twenty-two million, two hundred eighty-eight thousand, forty-four".