18149781888 has 512 divisors, whose sum is σ = 63745920000. Its totient is φ = 5080320000.

The previous prime is 18149781883. The next prime is 18149781913. The reversal of 18149781888 is 88818794181.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18149781883) 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, 72309763 + ... + 72310013.

It is an arithmetic number, because the mean of its divisors is an integer number (124503750).

Almost surely, 2^18149781888 is an apocalyptic number.

18149781888 is a gapful number since it is divisible by the number (18) 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 18149781888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31872960000).

18149781888 is an abundant number, since it is smaller than the sum of its proper divisors (45596138112).

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

18149781888 is an equidigital number, since it uses as much as digits as its factorization.

18149781888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356 (or 324 counting only the distinct ones).

The product of its digits is 8257536, while the sum is 63.

The spelling of 18149781888 in words is "eighteen billion, one hundred forty-nine million, seven hundred eighty-one thousand, eight hundred eighty-eight".