198268127089 has 2 divisors, whose sum is σ = 198268127090. Its totient is φ = 198268127088.

The previous prime is 198268127009. The next prime is 198268127117. The reversal of 198268127089 is 980721862891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167847534864 + 30420592225 = 409692^2 + 174415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198268127089 is a prime.

It is a super-2 number, since 2×198268127089² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (198268127009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99134063544 + 99134063545.

It is an arithmetic number, because the mean of its divisors is an integer number (99134063545).

Almost surely, 2^198268127089 is an apocalyptic number.

It is an amenable number.

198268127089 is a deficient number, since it is larger than the sum of its proper divisors (1).

198268127089 is an equidigital number, since it uses as much as digits as its factorization.

198268127089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6967296, while the sum is 61.

The spelling of 198268127089 in words is "one hundred ninety-eight billion, two hundred sixty-eight million, one hundred twenty-seven thousand, eighty-nine".