18163561300 has 72 divisors (see below), whose sum is σ = 41442894360. Its totient is φ = 6899827200.

The previous prime is 18163561253. The next prime is 18163561303. The reversal of 18163561300 is 316536181.

It can be written as a sum of positive squares in 12 ways, for example, as 11725424656 + 6438136644 = 108284^2 + 80238^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18163561303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 125562 + ... + 228238.

It is an arithmetic number, because the mean of its divisors is an integer number (575595755).

Almost surely, 2^18163561300 is an apocalyptic number.

18163561300 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 18163561300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20721447180).

18163561300 is an abundant number, since it is smaller than the sum of its proper divisors (23279333060).

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

18163561300 is a wasteful number, since it uses less digits than its factorization.

18163561300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102781 (or 102774 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 18163561300 in words is "eighteen billion, one hundred sixty-three million, five hundred sixty-one thousand, three hundred".