243204246553 has 2 divisors, whose sum is σ = 243204246554. Its totient is φ = 243204246552.

The previous prime is 243204246511. The next prime is 243204246559. The reversal of 243204246553 is 355642402342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243203826649 + 419904 = 493157^2 + 648^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243204246553 is a prime.

It is not a weakly prime, because it can be changed into another prime (243204246559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121602123276 + 121602123277.

It is an arithmetic number, because the mean of its divisors is an integer number (121602123277).

Almost surely, 2^243204246553 is an apocalyptic number.

It is an amenable number.

243204246553 is a deficient number, since it is larger than the sum of its proper divisors (1).

243204246553 is an equidigital number, since it uses as much as digits as its factorization.

243204246553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 691200, while the sum is 40.

Adding to 243204246553 its reverse (355642402342), we get a palindrome (598846648895).

The spelling of 243204246553 in words is "two hundred forty-three billion, two hundred four million, two hundred forty-six thousand, five hundred fifty-three".