243636121608 has 128 divisors (see below), whose sum is σ = 675314288640. Its totient is φ = 72626400000.

The previous prime is 243636121607. The next prime is 243636121709. The reversal of 243636121608 is 806121636342.

It is a self number, because there is not a number n which added to its sum of digits gives 243636121608.

It is not an unprimeable number, because it can be changed into a prime (243636121601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13274518 + ... + 13292858.

It is an arithmetic number, because the mean of its divisors is an integer number (5275892880).

Almost surely, 2^243636121608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243636121608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (337657144320).

243636121608 is an abundant number, since it is smaller than the sum of its proper divisors (431678167032).

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

243636121608 is a wasteful number, since it uses less digits than its factorization.

243636121608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19179 (or 19175 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The spelling of 243636121608 in words is "two hundred forty-three billion, six hundred thirty-six million, one hundred twenty-one thousand, six hundred eight".