243311552320 has 56 divisors (see below), whose sum is σ = 582586798248. Its totient is φ = 96786892800.

The previous prime is 243311552279. The next prime is 243311552321. The reversal of 243311552320 is 23255113342.

It can be written as a sum of positive squares in 4 ways, for example, as 546437376 + 242765114944 = 23376^2 + 492712^2 .

It is a super-2 number, since 2×243311552320² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243311552321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2042491 + ... + 2158330.

It is an arithmetic number, because the mean of its divisors is an integer number (10403335683).

Almost surely, 2^243311552320 is an apocalyptic number.

243311552320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243311552320 is an abundant number, since it is smaller than the sum of its proper divisors (339275245928).

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

243311552320 is a wasteful number, since it uses less digits than its factorization.

243311552320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4201019 (or 4201009 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 243311552320 its reverse (23255113342), we get a palindrome (266566665662).

The spelling of 243311552320 in words is "two hundred forty-three billion, three hundred eleven million, five hundred fifty-two thousand, three hundred twenty".