266766889 has 3 divisors (see below), whose sum is σ = 266783223. Its totient is φ = 266750556.

The previous prime is 266766881. The next prime is 266766917. The reversal of 266766889 is 988667662.

The square root of 266766889 is 16333.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 20025625 + 246741264 = 4475^2 + 15708^2 .

It is not a de Polignac number, because 266766889 - 2³ = 266766881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266766881) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 8167 + ... + 24499.

It is an arithmetic number, because the mean of its divisors is an integer number (88927741).

Almost surely, 2^266766889 is an apocalyptic number.

266766889 is the 16333-rd square number.

266766889 is the 8167-th centered octagonal number.

It is an amenable number.

266766889 is a deficient number, since it is larger than the sum of its proper divisors (16334).

266766889 is an frugal number, since it uses more digits than its factorization.

266766889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32666 (or 16333 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 58.

The cubic root of 266766889 is about 643.7402159697.

The spelling of 266766889 in words is "two hundred sixty-six million, seven hundred sixty-six thousand, eight hundred eighty-nine".