198347159809 has 2 divisors, whose sum is σ = 198347159810. Its totient is φ = 198347159808.

The previous prime is 198347159789. The next prime is 198347159831. The reversal of 198347159809 is 908951743891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130696710400 + 67650449409 = 361520^2 + 260097^2 .

It is an emirp because it is prime and its reverse (908951743891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198347159809 - 2¹¹ = 198347157761 is a prime.

It is not a weakly prime, because it can be changed into another prime (198347159909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99173579904 + 99173579905.

It is an arithmetic number, because the mean of its divisors is an integer number (99173579905).

Almost surely, 2^198347159809 is an apocalyptic number.

It is an amenable number.

198347159809 is a deficient number, since it is larger than the sum of its proper divisors (1).

198347159809 is an equidigital number, since it uses as much as digits as its factorization.

198347159809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19595520, while the sum is 64.

The spelling of 198347159809 in words is "one hundred ninety-eight billion, three hundred forty-seven million, one hundred fifty-nine thousand, eight hundred nine".