81112491984 has 40 divisors (see below), whose sum is σ = 209580996672. Its totient is φ = 27032285440.

The previous prime is 81112491959. The next prime is 81112492033. The reversal of 81112491984 is 48919421118.

It is a Harshad number since it is a multiple of its sum of digits (48).

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 7 ways as a sum of consecutive naturals, for example, 92869 + ... + 413339.

Almost surely, 2^81112491984 is an apocalyptic number.

It is an amenable number.

81112491984 is an abundant number, since it is smaller than the sum of its proper divisors (128468504688).

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

81112491984 is a wasteful number, since it uses less digits than its factorization.

81112491984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325755 (or 325749 counting only the distinct ones).

The product of its digits is 165888, while the sum is 48.

The spelling of 81112491984 in words is "eighty-one billion, one hundred twelve million, four hundred ninety-one thousand, nine hundred eighty-four".