204598455521 has 2 divisors, whose sum is σ = 204598455522. Its totient is φ = 204598455520.

The previous prime is 204598455511. The next prime is 204598455533. The reversal of 204598455521 is 125554895402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164319972496 + 40278483025 = 405364^2 + 200695^2 .

It is a cyclic number.

It is not a de Polignac number, because 204598455521 - 2¹⁸ = 204598193377 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 204598455521.

It is not a weakly prime, because it can be changed into another prime (204598455511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102299227760 + 102299227761.

It is an arithmetic number, because the mean of its divisors is an integer number (102299227761).

Almost surely, 2^204598455521 is an apocalyptic number.

It is an amenable number.

204598455521 is a deficient number, since it is larger than the sum of its proper divisors (1).

204598455521 is an equidigital number, since it uses as much as digits as its factorization.

204598455521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880000, while the sum is 50.

The spelling of 204598455521 in words is "two hundred four billion, five hundred ninety-eight million, four hundred fifty-five thousand, five hundred twenty-one".