18781132244 has 12 divisors (see below), whose sum is σ = 37562264544. Its totient is φ = 8049056664.

The previous prime is 18781132213. The next prime is 18781132247. The reversal of 18781132244 is 44223118781.

18781132244 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18781132247) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 335377334 + ... + 335377389.

It is an arithmetic number, because the mean of its divisors is an integer number (3130188712).

Almost surely, 2^18781132244 is an apocalyptic number.

18781132244 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18781132244 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18781132244 is a wasteful number, since it uses less digits than its factorization.

18781132244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670754734 (or 670754732 counting only the distinct ones).

The product of its digits is 86016, while the sum is 41.

The spelling of 18781132244 in words is "eighteen billion, seven hundred eighty-one million, one hundred thirty-two thousand, two hundred forty-four".