According to this article by CNN, of the world’s 1453 billionaires, about half reside in the U.S. or China, but the single city with the highest number of billionaire residents is Moscow at 70. And just in case you’re interested in the fascinating world of the obscenely wealthy, here’s a list of the 10 richest billionaires (quite literally the richest of the rich):

1. Carlos Slim Helu & family (Mexico – America Movil) : $66 billion

2. Warren Buffett (U.S. – Berkshire Hathaway): $58 billion

3. Amancio Ortega (Spain – Zara): $55 billion

4. Bill Gates (U.S. – Microsoft): $54 billion

5. Bernard Arnault (France – LVMH): $51 billion

6. Larry Ellison (U.S. – Oracle): $43 billion

7. Li Ka-shing (Hong Kong – Cheung Kong): $32 billion

8. Charles Koch (U.S. – Koch Industries): $31 billion

8. David Koch (U.S. – Koch Industries): $31 billion

10. Liliane Bettencourt (France – L’Oreal): $30 billion