18390805747128 has 24 divisors (see below), whose sum is σ = 49808432232000. Its totient is φ = 6130268582352.

The previous prime is 18390805747063. The next prime is 18390805747129. The reversal of 18390805747128 is 82174750809381.

18390805747128 is a `hidden beast` number, since 1 + 8 + 3 + 90 + 8 + 0 + 57 + 471 + 28 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18390805747129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 127713928728 + ... + 127713928871.

It is an arithmetic number, because the mean of its divisors is an integer number (2075351343000).

Almost surely, 2^{18390805747128} is an apocalyptic number.

18390805747128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18390805747128 is an abundant number, since it is smaller than the sum of its proper divisors (31417626484872).

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

18390805747128 is a wasteful number, since it uses less digits than its factorization.

18390805747128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255427857611 (or 255427857604 counting only the distinct ones).

The product of its (nonzero) digits is 27095040, while the sum is 63.

The spelling of 18390805747128 in words is "eighteen trillion, three hundred ninety billion, eight hundred five million, seven hundred forty-seven thousand, one hundred twenty-eight".