243144775500 has 192 divisors, whose sum is σ = 783936631296. Its totient is φ = 58064160000.

The previous prime is 243144775439. The next prime is 243144775507. The reversal of 243144775500 is 5577441342.

It is not an unprimeable number, because it can be changed into a prime (243144775507) 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, 995530 + ... + 1215470.

It is an arithmetic number, because the mean of its divisors is an integer number (4083003288).

Almost surely, 2^243144775500 is an apocalyptic number.

243144775500 is a gapful number since it is divisible by the number (20) 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 243144775500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (391968315648).

243144775500 is an abundant number, since it is smaller than the sum of its proper divisors (540791855796).

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

243144775500 is a wasteful number, since it uses less digits than its factorization.

243144775500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220041 (or 220029 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 42.

The spelling of 243144775500 in words is "two hundred forty-three billion, one hundred forty-four million, seven hundred seventy-five thousand, five hundred".