Most people don’t have a clue that there are small amounts of bitcoin which are used as alternative units. They are called millibitcoin and satoshi. Satoshi is the smallest amount of bitcoin, equals to 0.00000001 bitcoin, which is one hundred millionth of a bitcoin.
Nobody knows for sure how many crypto wallets are floating out there, in the online hyperspace, but it is estimated that there are between 6 million to 12 million active wallets storing cryptocurrency. More than half of cryptocurrency wallets offer storage for more than one cryptocurrency.