81056682072 has 64 divisors (see below), whose sum is σ = 225185532000. Its totient is φ = 27015524352.

The previous prime is 81056682061. The next prime is 81056682089. The reversal of 81056682072 is 27028665018.

81056682072 is a `hidden beast` number, since 8 + 1 + 0 + 566 + 82 + 0 + 7 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2200704 + ... + 2237232.

Almost surely, 2^81056682072 is an apocalyptic number.

It is an amenable number.

81056682072 is an abundant number, since it is smaller than the sum of its proper divisors (144128849928).

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

81056682072 is a wasteful number, since it uses less digits than its factorization.

81056682072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46817 (or 46807 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 81056682072 in words is "eighty-one billion, fifty-six million, six hundred eighty-two thousand, seventy-two".