One either hates those comparisons or loves them, I personally like them because a hundred billion is way to abstract for me. If you fill your 50 m² apartment to a height of 1 m with table salt, then you are looking at 400 billion grains of salt. [1]

[1] I once counted the grains in 1 cm³, there were pretty much exactly 8000 of them ignoring the very fine powder from crushed grains. 1 m³ of table salt gives you pretty much one grain of salt for every human on earth.