266881161 has 16 divisors (see below), whose sum is σ = 362387520. Its totient is φ = 174659520.

The previous prime is 266881157. The next prime is 266881183. The reversal of 266881161 is 161188662.

It is not a de Polignac number, because 266881161 - 2² = 266881157 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (266881361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119491 + ... + 121703.

It is an arithmetic number, because the mean of its divisors is an integer number (22649220).

Almost surely, 2^266881161 is an apocalyptic number.

It is an amenable number.

266881161 is a deficient number, since it is larger than the sum of its proper divisors (95506359).

266881161 is a wasteful number, since it uses less digits than its factorization.

266881161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2936.

The product of its digits is 27648, while the sum is 39.

The square root of 266881161 is about 16336.4978193002. The cubic root of 266881161 is about 643.8321201551.

The spelling of 266881161 in words is "two hundred sixty-six million, eight hundred eighty-one thousand, one hundred sixty-one".