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The Fibonagygas, coined by SuperJedi224, is equal to the billionth term of the fibonacci sequence (gygas being a modified form of the SI Giga-, for one billion), starting with the first one.[1]

It has exactly 208,987,640 digits.

Its prime factorization starts with 3 × 59 × 7 × 11 × 41 × 47 × 101 × 127 × 151 × 251 × 401 × 641 × 1087 × 1601 × 2161 × 2207 × 3001 × 3041 × 4001 × 4481 × 9601 × …

## Approximations in other notations

Notation Lower bound Upper bound
Scientific notation $$7.952\times10^{208\,987\,639}$$ $$7.953\times10^{208\,987\,639}$$
Arrow notation $$3112\uparrow59\,829\,737$$ $$2065\uparrow63\,044\,549$$
Steinhaus-Moser Notation 8[3][3] 9[3][3]
Copy notation 1[1[9]] 2[2[9]]
Taro's multivariable Ackermann function A(3,A(3,26)) A(3,A(3,27))
Pound-Star Notation #*((1))*5188 #*((1))*5189
BEAF {3112,59829737} {2065,63044549}
Hyper-E notation 7E208987639 8E208987639
Bashicu matrix system (0)(1)[5] (0)(1)[6]
Hyperfactorial array notation (10!)! (11!)!
Fast-growing hierarchy $$f_2(f_2(24))$$ $$f_2(f_2(25))$$
Hardy hierarchy $$H_{\omega^22}(24)$$ $$H_{\omega^22}(25)$$
Slow-growing hierarchy $$g_{\omega^{\omega^82}}(10)$$ $$g_{\omega^{\omega^82+\omega^7}}(10)$$

Fibonacci Numbers by SuperJedi224
Level One
Level Two

Fibonamega · Fibonagygas · Fibonatetris

Numbers By SuperJedi224

Fibonacci Numbers

Level One

Level Two

Fibonamega · Fibonagygas · Fibonatetris

#*

#**

H#*

#*{}

#*<<>>

H#*<<>>

Bingol series

Based on the Faxul

Other factorials

Googovipleccix family

Graham Sequence Numbers

-Illion numbers