81706715180 has 24 divisors (see below), whose sum is σ = 172032118272. Its totient is φ = 32597349632.

The previous prime is 81706715179. The next prime is 81706715219. The reversal of 81706715180 is 8151760718.

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 7 ways as a sum of consecutive naturals, for example, 5325677 + ... + 5340996.

It is an arithmetic number, because the mean of its divisors is an integer number (7168004928).

Almost surely, 2^81706715180 is an apocalyptic number.

It is an amenable number.

81706715180 is an abundant number, since it is smaller than the sum of its proper divisors (90325403092).

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

81706715180 is a wasteful number, since it uses less digits than its factorization.

81706715180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10667065 (or 10667063 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 44.

The spelling of 81706715180 in words is "eighty-one billion, seven hundred six million, seven hundred fifteen thousand, one hundred eighty".