User:27 is the best number/sandbox

$10^{506}-10^{253}-1$

Consonant chart for American English

		Labial	Dental	Alveolar	Post- alveolar	Palatal	Velar	Uvular	Glottal
Nasal		m	n				ng /ŋ/
Stop	Voiceless	p	t				k		/ʔ/
	Voiced	b	d				ɡ
Affricate	Voiceless				ch /t͡ʃ/
	Voiced				j /d͡ʒ/
Tap or flap			r /ɾ/
Fricative	Voiceless	f	th /θ/	s	sh /ʃ/		(ch /x/)		h
	Voiced	v	th /ð/	z	j /ʒ/
Approximant	Voiceless	(wh /ʍ/)					(wh /ʍ/)
	Voiced	w		l	r /ɹ̠/	y /j/	(w)

Hubble constant

Cursed units!

$${\begin{aligned}H_{0}&=70{\text{ km/s/Mpc}}\\&=70(1\times 10^{3}{\text{ m}})/{\text{s}}/(1\times 10^{6}{\text{ pc}})\\&=70(1\times 10^{3}{\text{ m}})/{\text{s}}/{\frac {(1\times 10^{6}{\cancel {\text{ pc}}}){\frac {648000}{\pi }}{\text{ AU}}}{1{\cancel {\text{ pc}}}}}\\&=70(1\times 10^{3}{\text{ m}})/{\text{s}}/{\frac {6.48\times 10^{11}}{\pi }}{\text{ AU}}\\&=70(1\times 10^{3}{\text{ m}})/{\text{s}}/{\Bigl (}{\frac {6.48\times 10^{11}}{\pi }}{\cancel {\text{ AU}}}{\Bigr )}{\Bigl (}{\frac {149\,597\,870\,700{\text{ m}}}{1{\cancel {\text{ AU}}}}}{\Bigr )}\\&=7.0\times 10^{4}{\text{ m}}/{\text{s}}/{\frac {9.69394202136\times 10^{22}}{\pi }}{\text{ m}}\\&={\frac {7.0\times 10^{4}{\text{ m}}}{1{\text{ s}}}}\cdot {\frac {\pi }{9.69394202136\times 10^{22}{\text{ m}}}}\\&={\frac {7.0\times 10^{4}{\cancel {\text{ m}}}}{1{\text{ s}}}}\cdot {\frac {\pi }{9.69394202136\times 10^{22}{\cancel {\text{ m}}}}}\\&={\frac {7.0\pi }{9.69394202136{\text{ s}}}}\times {\frac {10^{4}}{10^{22}}}\\&={\frac {7.0\pi }{9.69394202136{\text{ s}}}}\times {1 \over {10^{18}}}\\&={\frac {7.0\pi }{9.69394202136\times 10^{18}{\text{ s}}}}\\&\approx 2.2685455\times 10^{-18}{\text{ Hz}}\\\end{aligned}}$$