In the name of ALLAH SWT, the Beneficent, the Merciful,

 19 and The ROTATION Rotation is part of Mathematical System.   Found: 14 October 2000 Special Fact !! These numbers are the 180 degrees rotateable numbers 1,6 ,8 and 9  --- 1698 I couldn't find any rotation effects with this number (1689). But When I rotate it 180 degress (6891), I got it. If you rotate 6891 180 degrees, you'll find 1689 6891 180 1689 = 19 x 3626936931.0000 Delete 180 --- 6891 1689 = 19 x 3626931.0000  Please see more :  Fact 1 If you rotate 66 180degrees, you'll find 99 66 180 99 = 19 x 348321.0000 Fact 2 If you rotate 99 180 degrees, you'll find 66. if you rotate one more 180 degrees, it'll back to 99 99 180 66 180 99 = 19 x 52200348321.0000 Fact 3 If you rotate 61 180 degrees, you'll find 19 61 180 19 = 19 x 322001.0000 Fact 4 If you rotate 11 180 degrees, you'll find 11. if you rotate one more 180 degrees, it'll back to 11 11 180 11 180 11  = 19 x 5884269369.0000 Fact 5 If you rotate 666 180 degrees, you'll find 999. if you rotate one more 180 degrees, it'll back to 666 666 180 999180 666 = 19 x 35062157851614..0000 Fact 6 Number of surahs in Al-Qur'an = 114 surah = 19 x 6 -- found 619. If we make 9 as the mirror, we'll got number 61916 If you rotate 61916 180 degrees, you'll find 91619 61916 180 91619  = 19 x 325874636401.0000 Fact 7 If you rotate 181 180 degrees, you'll find 181 181 180 181 =19 x 9535799.0000 Fact 8 If you rotate 6688 180 degrees, you'll find 8899. if you rotate one more 180 degrees,  it'll back to 6688 6688 180 8899 180 6688 = 19 x 35200952052200352.0000 Fact 9  If you rotate 999666 180 degrees, you'll find 999666. if you rotate one more 180 degrees, it'll back to 999 666 999 666 180 999666 180  999 666 =  19 x 52614009526298220052614.0000   Can you find another numbers to rotate?

Praise to ALLAH the Almighty the Creator of the Universe
Blessings and Peace on the Muhammad s.a.w, his Family, and his Companions.