OTOH the phrase “a thousand million” for 10⁹ is not that uncommon. From what I've seen, in places where billions/trillions are mentioned and it's important that

OTOH the phrase “a thousand million” for 10⁹ is not that uncommon. From what I've seen, in places where billions/trillions are mentioned and it's important that the number is accurately specified, a representation with digits or the exponent of 10 are typically provided.