1226756666 has 16 divisors (see below), whose sum is σ = 1904540040. Its totient is φ = 591931200.

The previous prime is 1226756659. The next prime is 1226756747. The reversal of 1226756666 is 6666576221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 825355441 + 401401225 = 28729^2 + 20035^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1226756666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151316 + ... + 159216.

Almost surely, 2^1226756666 is an apocalyptic number.

1226756666 is a deficient number, since it is larger than the sum of its proper divisors (677783374).

1226756666 is a wasteful number, since it uses less digits than its factorization.

1226756666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10609.

The product of its digits is 1088640, while the sum is 47.

The square root of 1226756666 is about 35025.0862382950. The cubic root of 1226756666 is about 1070.4986949543.

The spelling of 1226756666 in words is "one billion, two hundred twenty-six million, seven hundred fifty-six thousand, six hundred sixty-six".