198304430561 has 2 divisors, whose sum is σ = 198304430562. Its totient is φ = 198304430560.

The previous prime is 198304430539. The next prime is 198304430563. The reversal of 198304430561 is 165034403891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192748218961 + 5556211600 = 439031^2 + 74540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198304430561 is a prime.

Together with 198304430563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198304430563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99152215280 + 99152215281.

It is an arithmetic number, because the mean of its divisors is an integer number (99152215281).

Almost surely, 2^198304430561 is an apocalyptic number.

It is an amenable number.

198304430561 is a deficient number, since it is larger than the sum of its proper divisors (1).

198304430561 is an equidigital number, since it uses as much as digits as its factorization.

198304430561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 198304430561 in words is "one hundred ninety-eight billion, three hundred four million, four hundred thirty thousand, five hundred sixty-one".