I just got home to use a proper calculator instead of estimating in my head, and with 700 quintillion (as per the screenshot / meme), and gold density less “roundabouted”, at 19000 kilos / cubic metre, this would be the same as a solid gold sphere of 8.9 kilometres in diameter (3rd root of 700 is 8.88 - and wow, my rough estimate of 1km for 1 quintillion was spot on! :)

And yes, that would absolutely be a planet killer asteroid. I don’t see how anything but primitive life forms on Earth could survive that: https://www.space.com/asteroid-apocalypse-how-big-can-humanity-survive