243203245520 has 80 divisors (see below), whose sum is σ = 570004231680. Its totient is φ = 96499200000.

The previous prime is 243203245507. The next prime is 243203245541. The reversal of 243203245520 is 25542302342.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×243203245520² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8671520 + ... + 8699520.

It is an arithmetic number, because the mean of its divisors is an integer number (7125052896).

Almost surely, 2^243203245520 is an apocalyptic number.

243203245520 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 243203245520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285002115840).

243203245520 is an abundant number, since it is smaller than the sum of its proper divisors (326800986160).

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

243203245520 is a wasteful number, since it uses less digits than its factorization.

243203245520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28884 (or 28878 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 32.

Adding to 243203245520 its reverse (25542302342), we get a palindrome (268745547862).

The spelling of 243203245520 in words is "two hundred forty-three billion, two hundred three million, two hundred forty-five thousand, five hundred twenty".