81575634112 has 28 divisors (see below), whose sum is σ = 185001885520. Its totient is φ = 34960985856.

The previous prime is 81575634043. The next prime is 81575634157. The reversal of 81575634112 is 21143657518.

It is a tau number, because it is divible by the number of its divisors (28).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91043787 + ... + 91044682.

Almost surely, 2^81575634112 is an apocalyptic number.

It is an amenable number.

81575634112 is an abundant number, since it is smaller than the sum of its proper divisors (103426251408).

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

81575634112 is a wasteful number, since it uses less digits than its factorization.

81575634112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182088488 (or 182088478 counting only the distinct ones).

The product of its digits is 201600, while the sum is 43.

The spelling of 81575634112 in words is "eighty-one billion, five hundred seventy-five million, six hundred thirty-four thousand, one hundred twelve".