81804625056 has 576 divisors, whose sum is σ = 320625164160. Its totient is φ = 19996139520.

The previous prime is 81804625033. The next prime is 81804625093. The reversal of 81804625056 is 65052640818.

81804625056 is a `hidden beast` number, since 8 + 1 + 80 + 4 + 62 + 505 + 6 = 666.

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 95 ways as a sum of consecutive naturals, for example, 7911666 + ... + 7921998.

It is an arithmetic number, because the mean of its divisors is an integer number (556640910).

Almost surely, 2^81804625056 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 81804625056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160312582080).

81804625056 is an abundant number, since it is smaller than the sum of its proper divisors (238820539104).

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

81804625056 is a wasteful number, since it uses less digits than its factorization.

81804625056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10394 (or 10373 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The spelling of 81804625056 in words is "eighty-one billion, eight hundred four million, six hundred twenty-five thousand, fifty-six".