198646367389 has 2 divisors, whose sum is σ = 198646367390.
Its totient is φ = 198646367388.
The previous prime is 198646367383. The next prime is 198646367393. The reversal of 198646367389 is 983763646891.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 148257341764 + 50389025625 = 385042^2 + 224475^2
It is a cyclic number.
It is not a de Polignac number, because 198646367389 - 25 = 198646367357 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (198646367383) 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, 99323183694 + 99323183695.
It is an arithmetic number, because the mean of its divisors is an integer number (99323183695).
Almost surely, 2198646367389 is an apocalyptic number.
It is an amenable number.
198646367389 is a deficient number, since it is larger than the sum of its proper divisors (1).
198646367389 is an equidigital number, since it uses as much as digits as its factorization.
198646367389 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 282175488, while the sum is 70.
The spelling of 198646367389 in words is "one hundred ninety-eight billion, six hundred forty-six million, three hundred sixty-seven thousand, three hundred eighty-nine".