198805817563 has 2 divisors, whose sum is σ = 198805817564. Its totient is φ = 198805817562.

The previous prime is 198805817503. The next prime is 198805817597. The reversal of 198805817563 is 365718508891.

It is a strong prime.

It is an emirp because it is prime and its reverse (365718508891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198805817563 - 2²⁹ = 198268946651 is a prime.

It is not a weakly prime, because it can be changed into another prime (198805817503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99402908781 + 99402908782.

It is an arithmetic number, because the mean of its divisors is an integer number (99402908782).

Almost surely, 2^198805817563 is an apocalyptic number.

198805817563 is a deficient number, since it is larger than the sum of its proper divisors (1).

198805817563 is an equidigital number, since it uses as much as digits as its factorization.

198805817563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14515200, while the sum is 61.

The spelling of 198805817563 in words is "one hundred ninety-eight billion, eight hundred five million, eight hundred seventeen thousand, five hundred sixty-three".