243201204540 has 384 divisors, whose sum is σ = 878051328000. Its totient is φ = 54735512832.

The previous prime is 243201204539. The next prime is 243201204583. The reversal of 243201204540 is 45402102342.

243201204540 is a `hidden beast` number, since 2 + 4 + 3 + 201 + 2 + 0 + 454 + 0 = 666.

It is a super-2 number, since 2×243201204540² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 138260181 + ... + 138261939.

It is an arithmetic number, because the mean of its divisors is an integer number (2286592000).

Almost surely, 2^243201204540 is an apocalyptic number.

243201204540 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 243201204540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (439025664000).

243201204540 is an abundant number, since it is smaller than the sum of its proper divisors (634850123460).

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

243201204540 is a wasteful number, since it uses less digits than its factorization.

243201204540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2326 (or 2318 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

Adding to 243201204540 its reverse (45402102342), we get a palindrome (288603306882).

The spelling of 243201204540 in words is "two hundred forty-three billion, two hundred one million, two hundred four thousand, five hundred forty".