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How fast is 635 times the speed of light?

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It's about 2,500,000,000 times as fast as a Helicopter.
In other words, 635 times the speed of light is 2,410,000,000 times the speed of a Helicopter, and the speed of a Helicopter is 0.0000000004150 times that amount.
(for AH-64A Apache, a.k.a. Hughes Model 77) (maximum cruise speed)
The AH-64 helicopter, one of the primary helicopters used by the United States Army, flies at a top cruise speed of 0.0000002630 times the speed of light. The AH-64 is the primary military helicopter of several nations including the United States, the United Kingdom, Israel, Japan, and the Netherlands.
It's about 2,500,000,000 times as fast as a Skydiver (headfirst).
In other words, the speed of a Skydiver (headfirst) is 0.000000000380 times 635 times the speed of light.
(Head-to-Earth orientation or standing, average conditions, terminal velocity)
A head-to-Earth or standing-oriented skydiver's terminal velocity assuming average conditions is about 0.000000240 times the speed of light. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 46 seconds.
It's about 3,500,000,000 times as fast as a Tornado.
In other words, 635 times the speed of light is 3,448,110,000 times the speed of a Tornado, and the speed of a Tornado is 0.00000000029001390 times that amount.
(EF2) (wind speed range average)
According to the Enhanced Fujita scale implemented by the US National Oceanographic and Atmospheric Administration, a "significant" tornado has an Enhanced Funjita scale classification of EF2 and is characterized by wind gust speeds between 0.00000016402810 times the speed of light and 0.00000020428960 times the speed of light. The largest recorded tornado — an F4 event occurring in Nebraska in May, 2004 — was almost 4.02 km (2.5 mi) across.
It's about 3,500,000,000 times as fast as a Skydiver (belly-to-earth).
In other words, the speed of a Skydiver (belly-to-earth) is 0.000000000280 times 635 times the speed of light.
(Belly-to-Earth orientation, average conditions, terminal velocity)
A belly-to-Earth oriented skydiver's terminal velocity is about 0.000000180 times the speed of light. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 60 seconds.
It's about 4,500,000,000 times as fast as a Fastball (baseball).
In other words, the speed of a Fastball (baseball) is 0.000000000220 times 635 times the speed of light.
(a.k.a. rising fastball, a.k.a. cross-seam fastball, a.k.a. heater, a.k.a. hummer, a.k.a. smoker; for four-seam grip) (major league average)
The average speed of major league fastball pitch is 0.000000140 times the speed of light. When up against the quickest professional fastball pitchers, a batter may have less than 0.4 seconds to react to a pitched ball.
It's about 5,500,000,000 times as fast as a Curveball (baseball).
In other words, the speed of a Curveball (baseball) is 0.000000000180 times 635 times the speed of light.
(a.k.a. hook, a.k.a. hammer, a.k.a. yakker) (major league average)
The average speed of major league curveball pitch is 0.000000110 times the speed of light. In the 1940's, debate over whether there really was a curve in the curveball pitch was settled with the conclusion that the ball does curve; however, an optical illusion caused by the spin of the ball and the batter's perception of motion exaggerates the extent of the curve.
It's about 6,000,000,000 times as fast as a Hurricane.
In other words, 635 times the speed of light is 5,750,000,000 times the speed of a Hurricane, and the speed of a Hurricane is 0.0000000001740 times that amount.
(formally: Topical cyclone; a.k.a. typhoon)
A hurricane is defined by the US National Hurricane Center as a Northern Hemisphere tropical storm having one-minute average wind-speeds of at least 0.000000110 times the speed of light. Typhoons Tip (October, 1979) and Keith (October, 1997) and Hurricanes Camille (August, 1969) and Allen (August, 1980) jointly hold the record for highest tropical storm wind speeds at 0.0000002870 times the speed of light.