1266278066 has 16 divisors (see below), whose sum is σ = 2000146560. Its totient is φ = 599587920.

The previous prime is 1266278059. The next prime is 1266278081. The reversal of 1266278066 is 6608726621.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137156 + ... + 146096.

It is an arithmetic number, because the mean of its divisors is an integer number (125009160).

Almost surely, 2^1266278066 is an apocalyptic number.

1266278066 is a deficient number, since it is larger than the sum of its proper divisors (733868494).

1266278066 is a wasteful number, since it uses less digits than its factorization.

1266278066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12689.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 1266278066 is about 35584.8010532587. The cubic root of 1266278066 is about 1081.8731969304.

The spelling of 1266278066 in words is "one billion, two hundred sixty-six million, two hundred seventy-eight thousand, sixty-six".