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Hash collision probability:

• https://preshing.com/20110504/hash-collision-probabilities/
• https://stats.stackexchange.com/questions/32984/how-to-calculate-with-tiny-probabilities-and-large-samples

For 64 bits:

• 7,000: 0.0000000001 %
• 20,000: 0.0000000011 %
• 61,000: 0.0000000101 %
• 193,000: 0.0000001010 %
• 608,000: 0.0000010020 %
• 1,921,000: 0.0000100024 %
• 6,075,000: 0.0001000328 %
• 19,208,000: 0.0010000286 %
• 60,742,000: 0.0100001552 %
• 192,125,000: 0.1000001853 %
• 608,927,000: 1.0000003881 %
• 1,971,578,000: 10.0000070121 %