It is a happy number.
It is a tau number, because it is divible by the number of its divisors (8).
It is an unprimeable number.
Almost surely, 21266123112 is an apocalyptic number.
It is an amenable number.
1266123112 is a wasteful number, since it uses less digits than its factorization.
1266123112 is an odious number, because the sum of its binary digits is odd.
The square root of 1266123112 is about 35582.6237368747. The cubic root of 1266123112 is about 1081.8290656499.
Adding to 1266123112 its reverse (2113216621), we get a palindrome (3379339733).
The spelling of 1266123112 in words is "one billion, two hundred sixty-six million, one hundred twenty-three thousand, one hundred twelve".