198519435227 has 2 divisors, whose sum is σ = 198519435228. Its totient is φ = 198519435226.

The previous prime is 198519435223. The next prime is 198519435259. The reversal of 198519435227 is 722534915891.

It is a weak prime.

It is an emirp because it is prime and its reverse (722534915891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198519435227 - 2² = 198519435223 is a prime.

It is not a weakly prime, because it can be changed into another prime (198519435221) 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, 99259717613 + 99259717614.

It is an arithmetic number, because the mean of its divisors is an integer number (99259717614).

Almost surely, 2^198519435227 is an apocalyptic number.

198519435227 is a deficient number, since it is larger than the sum of its proper divisors (1).

198519435227 is an equidigital number, since it uses as much as digits as its factorization.

198519435227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5443200, while the sum is 56.

The spelling of 198519435227 in words is "one hundred ninety-eight billion, five hundred nineteen million, four hundred thirty-five thousand, two hundred twenty-seven".