Off resistance of analog switch 4066 pretty low?
My databooks show an off-state leakage current of &plusmn;50 nA (max @ 25&deg;C, typically &plusmn;0.1 nA) for both the 4016 and the 4066. With a Vcc of 6V, you could model this as a resistance of approximately 108 &Omega;. I don't know why the model you found has such a low value.