607

607 is a prime number.

607 is the smallest prime resulting from the concatenation of two consecutive numbers separated by 0.

607 is the exponent of the Mersenne prime 2⁶⁰⁷ - 1.

607 is the smallest prime that can be expressed as the sum of 11 consecutive Fibonacci numbers: 607 = 2 + 3 + 5 + 8 + 13 + 21 + 34 + 55 + 89 + 144 + 233.

1650/607 is the closest fraction to e with a prime denominator less than 1000.

Halley's Comet was visible from Earth in the year 607.

Source: Prime Curios!