81750822552 has 96 divisors (see below), whose sum is σ = 255881527200. Its totient is φ = 23094922752.

The previous prime is 81750822551. The next prime is 81750822557. The reversal of 81750822552 is 25522805718.

81750822552 is a `hidden beast` number, since 8 + 1 + 75 + 0 + 8 + 22 + 552 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 81750822498 and 81750822507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81750822551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 866403 + ... + 956114.

It is an arithmetic number, because the mean of its divisors is an integer number (2665432575).

Almost surely, 2^81750822552 is an apocalyptic number.

It is an amenable number.

81750822552 is an abundant number, since it is smaller than the sum of its proper divisors (174130704648).

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

81750822552 is a wasteful number, since it uses less digits than its factorization.

81750822552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1822625 (or 1822618 counting only the distinct ones).

The product of its (nonzero) digits is 448000, while the sum is 45.

The spelling of 81750822552 in words is "eighty-one billion, seven hundred fifty million, eight hundred twenty-two thousand, five hundred fifty-two".