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There is no Hexakosioihexekontahexaphobia in Shanghai.

Here's more from Wikipedia:

Prominent hexakosioihexekontahexaphobes include the late Ronald Reagan and Nancy Reagan. In 1989, when they moved to the former president's final home in the Bel-Air section of Los Angeles, they had the address of 666 St. Cloud Road changed to 668.

The late Johnny Carson was probably not hexakosioihexekontahexaphobic because this address had earlier been his home.