81664512192 has 84 divisors (see below), whose sum is σ = 234167339640. Its totient is φ = 27210949632.

The previous prime is 81664512191. The next prime is 81664512247. The reversal of 81664512192 is 29121546618.

81664512192 is a `hidden beast` number, since 8 + 1 + 6 + 6 + 451 + 2 + 192 = 666.

It is not an unprimeable number, because it can be changed into a prime (81664512191) 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 11 ways as a sum of consecutive naturals, for example, 1536559 + ... + 1588817.

Almost surely, 2^81664512192 is an apocalyptic number.

It is an amenable number.

81664512192 is an abundant number, since it is smaller than the sum of its proper divisors (152502827448).

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

81664512192 is a wasteful number, since it uses less digits than its factorization.

81664512192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54990 (or 54977 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The spelling of 81664512192 in words is "eighty-one billion, six hundred sixty-four million, five hundred twelve thousand, one hundred ninety-two".