81120830052 has 24 divisors (see below), whose sum is σ = 190443180256. Its totient is φ = 26874384768.

The previous prime is 81120830051. The next prime is 81120830069. The reversal of 81120830052 is 25003802118.

It is not an unprimeable number, because it can be changed into a prime (81120830051) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 20734453 + ... + 20738364.

Almost surely, 2^81120830052 is an apocalyptic number.

It is an amenable number.

81120830052 is an abundant number, since it is smaller than the sum of its proper divisors (109322350204).

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

81120830052 is a wasteful number, since it uses less digits than its factorization.

81120830052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41472987 (or 41472985 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The spelling of 81120830052 in words is "eighty-one billion, one hundred twenty million, eight hundred thirty thousand, fifty-two".