1,000,000,001
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580,000,000 is equal to 0.58 billion.
2 875 000 000 rounded to the nearest billion is 3 billion.
2.57 billion kilometers is approximately 1.598 billion miles.
20 million plus 14.5 billion is equal to (0.02 + 14.5) billion = 14.52 billion = 14520000000
No, the Earth is estimated to be about 4.5 billion years old. The universe itself is around 13.8 billion years old.