81750566808 has 48 divisors (see below), whose sum is σ = 221421379920. Its totient is φ = 27248515776.

The previous prime is 81750566803. The next prime is 81750566851. The reversal of 81750566808 is 80866505718.

81750566808 is a `hidden beast` number, since 8 + 1 + 75 + 0 + 566 + 8 + 0 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81750566803) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1845285 + ... + 1889067.

It is an arithmetic number, because the mean of its divisors is an integer number (4612945415).

Almost surely, 2^81750566808 is an apocalyptic number.

It is an amenable number.

81750566808 is an abundant number, since it is smaller than the sum of its proper divisors (139670813112).

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

81750566808 is a wasteful number, since it uses less digits than its factorization.

81750566808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69728 (or 69721 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 54.

The spelling of 81750566808 in words is "eighty-one billion, seven hundred fifty million, five hundred sixty-six thousand, eight hundred eight".