81708222752 has 126 divisors (see below), whose sum is σ = 182174629077. Its totient is φ = 36071857536.

The previous prime is 81708222737. The next prime is 81708222773. The reversal of 81708222752 is 25722280718.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 4 ways, for example, as 69377452816 + 12330769936 = 263396^2 + 111044^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=202124.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 3552531413 + ... + 3552531435.

Almost surely, 2^81708222752 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 81708222752

81708222752 is an abundant number, since it is smaller than the sum of its proper divisors (100466406325).

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

81708222752 is an frugal number, since it uses more digits than its factorization.

81708222752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 44.

The spelling of 81708222752 in words is "eighty-one billion, seven hundred eight million, two hundred twenty-two thousand, seven hundred fifty-two".