"Measured in current US dollars, total global wealth rose from USD 117 trillion in 2000 to 317 trillion in mid-2018, a rise of USD 200 trillion, equivalent to roughly 2.5 times global GDP." Global wealth works out to $63,100 per adult.
The US economy, with its combination of high incomes and a large number of people, has many more milliionaires and ultra-high-worth individuals than other countries. Here's a figure showing the number of people with over $50 million in wealth across countries.
In different countries, what share of wealth is held by the top 1% of wealthholders? US wealth is more concentrated than Germany or China, but less so than Brazil, India, or Russia.