266648881 has 4 divisors (see below), whose sum is σ = 275843700. Its totient is φ = 257454064.

The previous prime is 266648849. The next prime is 266648897. The reversal of 266648881 is 188846662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 204947856 + 61701025 = 14316^2 + 7855^2 .

It is a cyclic number.

It is not a de Polignac number, because 266648881 - 2⁵ = 266648849 is a prime.

It is a super-2 number, since 2×266648881² = 142203251477104322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266648801) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4597366 + ... + 4597423.

It is an arithmetic number, because the mean of its divisors is an integer number (68960925).

Almost surely, 2^266648881 is an apocalyptic number.

It is an amenable number.

266648881 is a deficient number, since it is larger than the sum of its proper divisors (9194819).

266648881 is an equidigital number, since it uses as much as digits as its factorization.

266648881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9194818.

The product of its digits is 884736, while the sum is 49.

The square root of 266648881 is about 16329.3870368731. The cubic root of 266648881 is about 643.6452795253.

The spelling of 266648881 in words is "two hundred sixty-six million, six hundred forty-eight thousand, eight hundred eighty-one".