Weigh, not way. Oh no: much more. Our Earth masses (for technical reasons, we can't really say "weighs") about 6,000,000,000,000,000,000,000 tons (that's a "sextillion," when you want to say it out loud). By comparison, 4.5 billion is only 4,500,000,000.
45 US tons is 40.82 metric tons.
1 billion minutes = 1,901.32 years
0.0222
45 billion is 5 billion away from 50 billion. That is not very close at all, but it is closer to 50 billion than it is to 50 million, for example.
0.0222
45 billion.
No, "billion" should not be capitalized in a sentence like "45 billion dollars." It is only capitalized if it is part of a proper noun or at the beginning of a sentence.
45 billion
45 billion trillion.
45 billion, 672 million, 345 thousand, 618
45/8 tons is 9,250 pounds.
45 million tons = 4.08233133 × 1013 grams