243245355553 has 2 divisors, whose sum is σ = 243245355554. Its totient is φ = 243245355552.

The previous prime is 243245355523. The next prime is 243245355571. The reversal of 243245355553 is 355553542342.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176251351329 + 66994004224 = 419823^2 + 258832^2 .

It is a cyclic number.

It is not a de Polignac number, because 243245355553 - 2²⁵ = 243211801121 is a prime.

It is not a weakly prime, because it can be changed into another prime (243245355523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121622677776 + 121622677777.

It is an arithmetic number, because the mean of its divisors is an integer number (121622677777).

Almost surely, 2^243245355553 is an apocalyptic number.

It is an amenable number.

243245355553 is a deficient number, since it is larger than the sum of its proper divisors (1).

243245355553 is an equidigital number, since it uses as much as digits as its factorization.

243245355553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400000, while the sum is 46.

Adding to 243245355553 its reverse (355553542342), we get a palindrome (598798897895).

The spelling of 243245355553 in words is "two hundred forty-three billion, two hundred forty-five million, three hundred fifty-five thousand, five hundred fifty-three".