81989592386976 has 96 divisors (see below), whose sum is σ = 239138073417600. Its totient is φ = 27329662725120.

The previous prime is 81989592386971. The next prime is 81989592386987. The reversal of 81989592386976 is 67968329598918.

81989592386976 is a `hidden beast` number, since 8 + 1 + 9 + 8 + 9 + 592 + 3 + 8 + 6 + 9 + 7 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (81989592386971) by changing a digit.

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, 158918040 + ... + 159433128.

It is an arithmetic number, because the mean of its divisors is an integer number (2491021598100).

Almost surely, 2^{81989592386976} is an apocalyptic number.

It is an amenable number.

81989592386976 is an abundant number, since it is smaller than the sum of its proper divisors (157148481030624).

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

81989592386976 is a wasteful number, since it uses less digits than its factorization.

81989592386976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699339 (or 699325 counting only the distinct ones).

The product of its digits is 25395793920, while the sum is 90.

The spelling of 81989592386976 in words is "eighty-one trillion, nine hundred eighty-nine billion, five hundred ninety-two million, three hundred eighty-six thousand, nine hundred seventy-six".