18533818368 has 336 divisors, whose sum is σ = 58787315496. Its totient is φ = 5591531520.

The previous prime is 18533818361. The next prime is 18533818399. The reversal of 18533818368 is 86381833581.

18533818368 is a `hidden beast` number, since 185 + 3 + 381 + 83 + 6 + 8 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2910818304 + 15623000064 = 53952^2 + 124992^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18533818361) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58466146 + ... + 58466462.

Almost surely, 2^18533818368 is an apocalyptic number.

18533818368 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 18533818368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29393657748).

18533818368 is an abundant number, since it is smaller than the sum of its proper divisors (40253497128).

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

18533818368 is a wasteful number, since it uses less digits than its factorization.

18533818368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423 (or 396 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 54.

The spelling of 18533818368 in words is "eighteen billion, five hundred thirty-three million, eight hundred eighteen thousand, three hundred sixty-eight".