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67 (number)

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This is thelatest accepted revision,reviewed on12 January 2026.
This article is about the number. For the meme, see6-7 meme. For other uses, see67.

Natural number
← 6667 68 →
Cardinalsixty-seven
Ordinal67th
(sixty-seventh)
Factorizationprime
Prime19th
Divisors1, 67
Greek numeralΞΖ´
Roman numeralLXVII,lxvii
Binary10000112
Ternary21113
Senary1516
Octal1038
Duodecimal5712
Hexadecimal4316

67 (sixty-seven) is thenatural number following66 and preceding68. It is anodd andprime number.

In mathematics

67 is aChen prime,[1] anirregular prime,[2] alucky prime,[3] aHeegner number,[4] asexy prime, and aPillai prime. It is also2/3{\displaystyle 2/3}rounded to the nearestwhole number as apercent.

Internet culture

Main article:6-7 meme

6-7 is ameme, typically popularized byGeneration Alpha. It was originally from a rap song called "Doot Doot (6 7)".[5][6] It is also associated with basketball playerLaMelo Ball, who is 6 ft 7 in (2.01 m) in height.[7] It is cited as part of thebrainrot phenomenon, or poor-quality digital media.[8] "6-7" is often accompanied by a hand gesture, and reportedly means nothing. Due to popularity and widespread use by young people,Dictionary.com named it the word of the year for 2025.[9][10]

References

  1. ^"Sloane's A109611: Chen primes".The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved2021-01-08.
  2. ^"Sloane's A000928 : Irregular primes".The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved2016-05-29.
  3. ^"Sloane's A031157 : Numbers that are both lucky and prime".The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved2016-05-29.
  4. ^"Sloane's A003173 : Heegner numbers".The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved2016-05-29.
  5. ^Placido, Dani Di."What Does '6-7' Mean? The TikTok Meme, Explained".Forbes. Retrieved2025-10-14.
  6. ^Thrasher, Tyler (2025-08-19)."Gen Alpha slang in 2025: The meaning behind words like 'clanker,' '67,' 'crashout'".FOX 5 NY. Retrieved2025-10-14.
  7. ^Hinde, Natasha (2025-07-31)."Kids Keep Saying 'Six-Seven' And Nobody Seems To Know What It Means".HuffPost UK. Retrieved2025-10-14.
  8. ^Robinson, Lauern."6-7' trend: New 'brain rot' phrase sweeps Aussie classrooms".News.com.au.
  9. ^Andrew, Scottie (2025-10-18)."The '6-7' meme can be annoying. But kids are shouting it for good reason".CNN. Retrieved2025-12-19.
  10. ^"Dictionary.com's 2025 Word of the Year Is… | Dictionary.com".Dictionary.com. Retrieved10 January 2026.
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