198625803791 has 2 divisors, whose sum is σ = 198625803792. Its totient is φ = 198625803790.

The previous prime is 198625803781. The next prime is 198625803793. The reversal of 198625803791 is 197308526891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198625803791 is a prime.

It is a Sophie Germain prime.

Together with 198625803793, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 198625803791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198625803793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99312901895 + 99312901896.

It is an arithmetic number, because the mean of its divisors is an integer number (99312901896).

Almost surely, 2^198625803791 is an apocalyptic number.

198625803791 is a deficient number, since it is larger than the sum of its proper divisors (1).

198625803791 is an equidigital number, since it uses as much as digits as its factorization.

198625803791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6531840, while the sum is 59.

The spelling of 198625803791 in words is "one hundred ninety-eight billion, six hundred twenty-five million, eight hundred three thousand, seven hundred ninety-one".