18165843780 has 192 divisors, whose sum is σ = 59209285632. Its totient is φ = 4075868160.

The previous prime is 18165843749. The next prime is 18165843781. The reversal of 18165843780 is 8734856181.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18165843781) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5172225 + ... + 5175735.

It is an arithmetic number, because the mean of its divisors is an integer number (308381696).

Almost surely, 2^18165843780 is an apocalyptic number.

18165843780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18165843780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29604642816).

18165843780 is an abundant number, since it is smaller than the sum of its proper divisors (41043441852).

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

18165843780 is a wasteful number, since it uses less digits than its factorization.

18165843780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3754 (or 3752 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 51.

The spelling of 18165843780 in words is "eighteen billion, one hundred sixty-five million, eight hundred forty-three thousand, seven hundred eighty".