81184220888304 has 40 divisors (see below), whose sum is σ = 209743933935312. Its totient is φ = 27059080514560.

The previous prime is 81184220888263. The next prime is 81184220888321. The reversal of 81184220888304 is 40388802248118.

81184220888304 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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, 72137307 + ... + 73254074.

Almost surely, 2^{81184220888304} is an apocalyptic number.

It is an amenable number.

81184220888304 is an abundant number, since it is smaller than the sum of its proper divisors (128559713047008).

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

81184220888304 is a wasteful number, since it uses less digits than its factorization.

81184220888304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145403025 (or 145403019 counting only the distinct ones).

The product of its (nonzero) digits is 6291456, while the sum is 57.

The spelling of 81184220888304 in words is "eighty-one trillion, one hundred eighty-four billion, two hundred twenty million, eight hundred eighty-eight thousand, three hundred four".