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I'm not sure this would help. The error was likely in thinkspace, not a literal typo. The real problem is when people toss around numbers without deeply understanding them. I don't think there's any simple fix for that. You simply can't reliably funnel information through a channel as narrow as a single number, nor the equivalent short phrase of number words.

One extra?

Maybe bbillion pronounced b-billion would be better.

And to add confusion, note that UK English had

1e6 million 1e9 thousand million 1e12 billion (million million)

I think this has mostly consolidated to the US usage now

Two extra letters. Numbers matter :).