1266516666 has 24 divisors (see below), whose sum is σ = 2863429920. Its totient is φ = 403816776.

The previous prime is 1266516653. The next prime is 1266516733. The reversal of 1266516666 is 6666156621.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1529196 + ... + 1530023.

It is an arithmetic number, because the mean of its divisors is an integer number (119309580).

Almost surely, 2^1266516666 is an apocalyptic number.

1266516666 is an abundant number, since it is smaller than the sum of its proper divisors (1596913254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1266516666 is a wasteful number, since it uses less digits than its factorization.

1266516666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3059250 (or 3059247 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 1266516666 is about 35588.1534502705. The cubic root of 1266516666 is about 1081.9411437583.

The spelling of 1266516666 in words is "one billion, two hundred sixty-six million, five hundred sixteen thousand, six hundred sixty-six".