Sorry, no online dictionaries contain the exact phrase countless number.
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Reverse dictionary results:
1. myriad
 2. innumerable
3. multitude
4. plethora
5. plurality
6. numerosity
7. multitudinous
8. several
9. concurrent
10. manifold
 11. modal
12. parallel
13. cofounded
14. collateral
15. countably
16. countlessness
17. legion
18. legionary
19. many
20. outlier
 21. sundry
22. universal
23. innumerably
24. mean
25. mean proportional
26. minimax
27. minmax
28. overnumerous
29. parallelism
30. relation
 31. relationship
32. singular statement
33. umbrella term
34. arithmetic average
35. arithmetic mean
36. arity
37. average
38. coincident

You can look up the words in the phrase individually using these links:   countless ?   number ?
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