81760968976 has 40 divisors (see below), whose sum is σ = 161433696600. Its totient is φ = 40100975616.

The previous prime is 81760968973. The next prime is 81760969001. The reversal of 81760968976 is 67986906718.

It can be written as a sum of positive squares in 4 ways, for example, as 31371494400 + 50389474576 = 177120^2 + 224476^2 .

It is not an unprimeable number, because it can be changed into a prime (81760968973) by changing a digit.

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, 7922796 + ... + 7933108.

It is an arithmetic number, because the mean of its divisors is an integer number (4035842415).

Almost surely, 2^81760968976 is an apocalyptic number.

It is an amenable number.

81760968976 is a deficient number, since it is larger than the sum of its proper divisors (79672727624).

81760968976 is a wasteful number, since it uses less digits than its factorization.

81760968976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19723 (or 19717 counting only the distinct ones).

The product of its (nonzero) digits is 54867456, while the sum is 67.

The spelling of 81760968976 in words is "eighty-one billion, seven hundred sixty million, nine hundred sixty-eight thousand, nine hundred seventy-six".