How is $100 million dollars written?

I must ask, "How does one properly represent one hundred million dollars in writing?" The concept seems straightforward enough, yet there could be various methods to convey such a large sum. Would it be simply "100,000,000 dollars," or is there a more formal or professional way to express it? Given the context of financial transactions and cryptocurrency, precision is paramount. Could there be a specific format or notation that is commonly used in the industry? I'm curious to know the standard way to write such a large amount, ensuring clarity and accuracy.