1,000,000,000
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A billion is 1,000 million
10^18 or 1,000,000,000,000,000,000which is 1 quintillion.
Expressed in numbers, this is equal to 100,000,000,000,000,000,000, or 1 followed by 20 zeroes.
1 + 1,000,000,000 = 1 billion + 12 + 999,999,999 = 1 billion + 13 + 999,999,998 = 1 billion + 14 + 999,999,997 = 1 billion + 15 + 999,999,996 = 1 billion + 1...499,999,999 + 500,000,001 = 1 billion + 1Altogether, you have (500 million) pairs, each one adding up to (1 billion + 1).The sum is 500,000,000,500,000,000 .That's (500 million billion) plus (500 million) .
a million million= one billion 1000,0002=one billion