198268127009 has 2 divisors, whose sum is σ = 198268127010. Its totient is φ = 198268127008.

The previous prime is 198268126921. The next prime is 198268127089. The reversal of 198268127009 is 900721862891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187627585600 + 10640541409 = 433160^2 + 103153^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198268127009 is a prime.

It is not a weakly prime, because it can be changed into another prime (198268127089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99134063504 + 99134063505.

It is an arithmetic number, because the mean of its divisors is an integer number (99134063505).

Almost surely, 2^198268127009 is an apocalyptic number.

It is an amenable number.

198268127009 is a deficient number, since it is larger than the sum of its proper divisors (1).

198268127009 is an equidigital number, since it uses as much as digits as its factorization.

198268127009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 53.

The spelling of 198268127009 in words is "one hundred ninety-eight billion, two hundred sixty-eight million, one hundred twenty-seven thousand, nine".