243312215540 has 24 divisors (see below), whose sum is σ = 533171116800. Its totient is φ = 93093369248.

The previous prime is 243312215491. The next prime is 243312215551. The reversal of 243312215540 is 45512213342.

243312215540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 243312215497 and 243312215506.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264469340 + ... + 264470259.

It is an arithmetic number, because the mean of its divisors is an integer number (22215463200).

Almost surely, 2^243312215540 is an apocalyptic number.

243312215540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243312215540 is an abundant number, since it is smaller than the sum of its proper divisors (289858901260).

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

243312215540 is a wasteful number, since it uses less digits than its factorization.

243312215540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528939631 (or 528939629 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 243312215540 its reverse (45512213342), we get a palindrome (288824428882).

The spelling of 243312215540 in words is "two hundred forty-three billion, three hundred twelve million, two hundred fifteen thousand, five hundred forty".