198011997845569 has 2 divisors, whose sum is σ = 198011997845570. Its totient is φ = 198011997845568.

The previous prime is 198011997845549. The next prime is 198011997845611. The reversal of 198011997845569 is 965548799110891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183908315238400 + 14103682607169 = 13561280^2 + 3755487^2 .

It is a cyclic number.

It is not a de Polignac number, because 198011997845569 - 2⁵ = 198011997845537 is a prime.

It is a super-2 number, since 2×198011997845569² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 198011997845492 and 198011997845501.

It is not a weakly prime, because it can be changed into another prime (198011997845549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99005998922784 + 99005998922785.

It is an arithmetic number, because the mean of its divisors is an integer number (99005998922785).

Almost surely, 2^{198011997845569} is an apocalyptic number.

It is an amenable number.

198011997845569 is a deficient number, since it is larger than the sum of its proper divisors (1).

198011997845569 is an equidigital number, since it uses as much as digits as its factorization.

198011997845569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1763596800, while the sum is 82.

The spelling of 198011997845569 in words is "one hundred ninety-eight trillion, eleven billion, nine hundred ninety-seven million, eight hundred forty-five thousand, five hundred sixty-nine".