A billion is 1 followed by 9 zeroes, or 1,000,000,000. 27 billion billion billion would be 27 followed by 27 zeroes, or 27e27. In long form: 27,000,000,000,000,000,000,000,000,000 In words, twenty...
10000000001000000000 = 10,000,000,001,000,000,000
1,000,000,000 x 1,000,000,000 x 1,000,000,000 = 1,000,000,000,000,000,000,000,000,000
3,900,000,000
3.9 billion is 3900 million.