266226666818 has 18 divisors (see below), whose sum is σ = 464547280473. Its totient is φ = 114094953840.

The previous prime is 266226666757. The next prime is 266226666841. The reversal of 266226666818 is 818666622662.

It can be written as a sum of positive squares in 2 ways, for example, as 250633400689 + 15593266129 = 500633^2 + 124873^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=364847.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5081798 + ... + 5133918.

Almost surely, 2^266226666818 is an apocalyptic number.

266226666818 is a deficient number, since it is larger than the sum of its proper divisors (198320613655).

266226666818 is an frugal number, since it uses more digits than its factorization.

266226666818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104258 (or 52130 counting only the distinct ones).

The product of its digits is 23887872, while the sum is 59.

The spelling of 266226666818 in words is "two hundred sixty-six billion, two hundred twenty-six million, six hundred sixty-six thousand, eight hundred eighteen".