204243205513 has 2 divisors, whose sum is σ = 204243205514. Its totient is φ = 204243205512.

The previous prime is 204243205501. The next prime is 204243205541. The reversal of 204243205513 is 315502342402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151654167184 + 52589038329 = 389428^2 + 229323^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204243205513 is a prime.

It is not a weakly prime, because it can be changed into another prime (204243205583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102121602756 + 102121602757.

It is an arithmetic number, because the mean of its divisors is an integer number (102121602757).

Almost surely, 2^204243205513 is an apocalyptic number.

It is an amenable number.

204243205513 is a deficient number, since it is larger than the sum of its proper divisors (1).

204243205513 is an equidigital number, since it uses as much as digits as its factorization.

204243205513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 204243205513 its reverse (315502342402), we get a palindrome (519745547915).

The spelling of 204243205513 in words is "two hundred four billion, two hundred forty-three million, two hundred five thousand, five hundred thirteen".