hello, how much is the insurance of thanatos?
The bigger question is; is it worth it? You pay 255.4m more just to get (effectively) 255.3m more in payout. Of course if you know that it will be destroyed in the 3 months that the insureance lasts, then it will pay off.
One should think the death of the ship is one of the few things in Eve, that always can be arranged.