198268127777 has 2 divisors, whose sum is σ = 198268127778. Its totient is φ = 198268127776.

The previous prime is 198268127747. The next prime is 198268127779. The reversal of 198268127777 is 777721862891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188494037281 + 9774090496 = 434159^2 + 98864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198268127777 is a prime.

Together with 198268127779, 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 (198268127779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99134063888 + 99134063889.

It is an arithmetic number, because the mean of its divisors is an integer number (99134063889).

Almost surely, 2^198268127777 is an apocalyptic number.

It is an amenable number.

198268127777 is a deficient number, since it is larger than the sum of its proper divisors (1).

198268127777 is an equidigital number, since it uses as much as digits as its factorization.

198268127777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33191424, while the sum is 65.

The spelling of 198268127777 in words is "one hundred ninety-eight billion, two hundred sixty-eight million, one hundred twenty-seven thousand, seven hundred seventy-seven".