198363825809 has 2 divisors, whose sum is σ = 198363825810. Its totient is φ = 198363825808.

The previous prime is 198363825799. The next prime is 198363825823. The reversal of 198363825809 is 908528363891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196096637584 + 2267188225 = 442828^2 + 47615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198363825809 is a prime.

It is not a weakly prime, because it can be changed into another prime (198363825509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99181912904 + 99181912905.

It is an arithmetic number, because the mean of its divisors is an integer number (99181912905).

Almost surely, 2^198363825809 is an apocalyptic number.

It is an amenable number.

198363825809 is a deficient number, since it is larger than the sum of its proper divisors (1).

198363825809 is an equidigital number, since it uses as much as digits as its factorization.

198363825809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22394880, while the sum is 62.

The spelling of 198363825809 in words is "one hundred ninety-eight billion, three hundred sixty-three million, eight hundred twenty-five thousand, eight hundred nine".