61

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61 < 60 | 62 >
Numbers 0 - 99
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10	11	12	13	14	15	16	17	18	19
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30	31	32	33	34	35	36	37	38	39
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70	71	72	73	74	75	76	77	78	79
80	81	82	83	84	85	86	87	88	89
90	91	92	93	94	95	96	97	98	99

61 (sixty-one) is a positive integer following 60 and preceding 62. Its ordinal form is written "sixty-first" or 61st.

Properties

• 61 is an odd prime number.
• 61 is the 9th Mersenne exponent.
• 61 is equivalent to gagthree using the Gag- prefix.

In googology

• Greek-based number-naming systems, 61 is associated with prefix "henhexaconta-", and with prefix "unsexaginti-" in Latin systems.
• It is one of the values of the weak Goodstein function: \(g(5)=61\).
• It is equal to gag-three with the gag prefix, since A(3,3) in the Ackermann function equals 61.

In science

• There are 61 particles in the Standard Model.
• It is also the atomic number of the chemical element promethium, the first one having no isotopes with a half-life longer than that of humans.

Numbers named with the fuga- family of prefixes

Gar-: garone · gartwo · garthree · garfour · garfive · garsix · garseven · gareight · garnine · garten · garhundred · garmillion · gargoogol · gareceton · gartrialogue · gargoogolplex · gargiggol
Fz-: fzone · fztwo · fzthree · fzfour · fzfive · fzsix · fzseven · fzeight · fznine · fzten · fztwenty · fzthirty · fzhundred · fzthousand · fzmillion · fzgoogol · fzmilliplexion · fzgoogolplex · fzgargoogolplex · fzgiggol
Fuga-: fugaone · fugatwo · fugathree · fugafour · fugafive · fugasix · fugaseven · fugaeight · fuganine · fugaten · fugahundred · fugagoogol · fugagoogolplex · fugagargoogolplex · fugagiggol
Megafuga-: megafugaone · megafugatwo · megafugathree · megafugafour · megafugafive · megafugasix · megafugaseven · megafugaeight · megafuganine · megafugaten · megafugahundred · megafugagoogol · megafugagoogolplex · megafugagargoogolplex · megafugagargantugoogolplex · megafugagrangol
Extensions:
Booga-:: boogaone · boogatwo · boogathree · boogafour · boogafive · boogasix · boogaten · boogahundred · boogagoogol · boogagoogolplex
Gag-:: gagone · gagtwo · gagthree · gagfour · gagfive · gagsix · gagseven · gageight · gagnine · gagten · gaggoogol · gaggoogolplex