266042881 has 8 divisors (see below), whose sum is σ = 291914280. Its totient is φ = 240943872.

The previous prime is 266042831. The next prime is 266042929. The reversal of 266042881 is 188240662.

It can be written as a sum of positive squares in 4 ways, for example, as 29160000 + 236882881 = 5400^2 + 15391^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-266042881 is a prime.

It is a super-2 number, since 2×266042881² = 141557629061560322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 266042881.

It is not an unprimeable number, because it can be changed into a prime (266042831) 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 7 ways as a sum of consecutive naturals, for example, 192376 + ... + 193753.

It is an arithmetic number, because the mean of its divisors is an integer number (36489285).

Almost surely, 2^266042881 is an apocalyptic number.

It is an amenable number.

266042881 is a deficient number, since it is larger than the sum of its proper divisors (25871399).

266042881 is a wasteful number, since it uses less digits than its factorization.

266042881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386195.

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 266042881 is about 16310.8209787245. The cubic root of 266042881 is about 643.1573158613.

The spelling of 266042881 in words is "two hundred sixty-six million, forty-two thousand, eight hundred eighty-one".