81750759552 has 432 divisors, whose sum is σ = 300818249550. Its totient is φ = 21232189440.

The previous prime is 81750759547. The next prime is 81750759569. The reversal of 81750759552 is 25595705718.

81750759552 is a `hidden beast` number, since 8 + 17 + 5 + 0 + 75 + 9 + 552 = 666.

It can be written as a sum of positive squares in only one way, i.e., 79944169536 + 1806590016 = 282744^2 + 42504^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 6824224 + ... + 6836192.

Almost surely, 2^81750759552 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 81750759552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150409124775).

81750759552 is an abundant number, since it is smaller than the sum of its proper divisors (219067489998).

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

81750759552 is a wasteful number, since it uses less digits than its factorization.

81750759552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12025 (or 11992 counting only the distinct ones).

The product of its (nonzero) digits is 4410000, while the sum is 54.

The spelling of 81750759552 in words is "eighty-one billion, seven hundred fifty million, seven hundred fifty-nine thousand, five hundred fifty-two".