18363327840 has 720 divisors, whose sum is σ = 75341251440. Its totient is φ = 4047943680.

The previous prime is 18363327817. The next prime is 18363327847. The reversal of 18363327840 is 4872336381.

18363327840 is a `hidden beast` number, since 1 + 8 + 3 + 633 + 2 + 7 + 8 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18363327847) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 274079487 + ... + 274079553.

It is an arithmetic number, because the mean of its divisors is an integer number (104640627).

Almost surely, 2^18363327840 is an apocalyptic number.

18363327840 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 18363327840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37670625720).

18363327840 is an abundant number, since it is smaller than the sum of its proper divisors (56977923600).

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

18363327840 is a wasteful number, since it uses less digits than its factorization.

18363327840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 18363327840 in words is "eighteen billion, three hundred sixty-three million, three hundred twenty-seven thousand, eight hundred forty".