18363558400 has 120 divisors (see below), whose sum is σ = 49633635744. Its totient is φ = 6677606400.

The previous prime is 18363558397. The next prime is 18363558407. The reversal of 18363558400 is 485536381.

It is a super-2 number, since 2×18363558400² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18363558407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75589 + ... + 206011.

Almost surely, 2^18363558400 is an apocalyptic number.

18363558400 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 18363558400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24816817872).

18363558400 is an abundant number, since it is smaller than the sum of its proper divisors (31270077344).

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

18363558400 is a wasteful number, since it uses less digits than its factorization.

18363558400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130462 (or 130441 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 18363558400 in words is "eighteen billion, three hundred sixty-three million, five hundred fifty-eight thousand, four hundred".