266881138 has 8 divisors (see below), whose sum is σ = 405805788. Its totient is φ = 131612544.

The previous prime is 266881133. The next prime is 266881157. The reversal of 266881138 is 831188662.

266881138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 222218649 + 44662489 = 14907^2 + 6683^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 266881094 and 266881103.

It is not an unprimeable number, because it can be changed into a prime (266881133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 913831 + ... + 914122.

Almost surely, 2^266881138 is an apocalyptic number.

266881138 is a deficient number, since it is larger than the sum of its proper divisors (138924650).

266881138 is a wasteful number, since it uses less digits than its factorization.

266881138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828028.

The product of its digits is 110592, while the sum is 43.

The square root of 266881138 is about 16336.4971153549. The cubic root of 266881138 is about 643.8321016598.

The spelling of 266881138 in words is "two hundred sixty-six million, eight hundred eighty-one thousand, one hundred thirty-eight".