243320440553 has 8 divisors (see below), whose sum is σ = 243735370368. Its totient is φ = 242905625424.

The previous prime is 243320440549. The next prime is 243320440579. The reversal of 243320440553 is 355044023342.

It is a happy number.

243320440553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243320440553 - 2² = 243320440549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243320440543) by changing a digit.

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, 4943975 + ... + 4992947.

It is an arithmetic number, because the mean of its divisors is an integer number (30466921296).

Almost surely, 2^243320440553 is an apocalyptic number.

It is an amenable number.

243320440553 is a deficient number, since it is larger than the sum of its proper divisors (414929815).

243320440553 is an equidigital number, since it uses as much as digits as its factorization.

243320440553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57343.

The product of its (nonzero) digits is 172800, while the sum is 35.

Adding to 243320440553 its reverse (355044023342), we get a palindrome (598364463895).

The spelling of 243320440553 in words is "two hundred forty-three billion, three hundred twenty million, four hundred forty thousand, five hundred fifty-three".