How many zeroes are there in one billion?

9.

The number 1 billion has 9 zeroes. Written in numerical notation, 1 billion is equivalent to 1,000,000,000.  It is also sometimes called one thousand million and is written in scientific notation as 1×10⁹ or just 10⁹. The word billion comes from the French word byllion which referred to ‘Ëœtwo’â„¢ + (m)illion and later altered into ‘Ëœa thousand million’â„¢.