81183489384 has 32 divisors (see below), whose sum is σ = 202967255520. Its totient is φ = 27060025536.

The previous prime is 81183489349. The next prime is 81183489397. The reversal of 81183489384 is 48398438118.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 668874 + ... + 780870.

It is an arithmetic number, because the mean of its divisors is an integer number (6342726735).

Almost surely, 2^81183489384 is an apocalyptic number.

It is an amenable number.

81183489384 is an abundant number, since it is smaller than the sum of its proper divisors (121783766136).

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

81183489384 is a wasteful number, since it uses less digits than its factorization.

81183489384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142209 (or 142205 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 57.

The spelling of 81183489384 in words is "eighty-one billion, one hundred eighty-three million, four hundred eighty-nine thousand, three hundred eighty-four".