266880689 has 4 divisors (see below), whose sum is σ = 268580724. Its totient is φ = 265180656.

The previous prime is 266880641. The next prime is 266880701. The reversal of 266880689 is 986088662.

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 132135025 + 134745664 = 11495^2 + 11608^2 .

It is a cyclic number.

It is not a de Polignac number, because 266880689 - 2¹² = 266876593 is a prime.

It is a super-2 number, since 2×266880689² = 142450604322229442, 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 266880689.

It is not an unprimeable number, because it can be changed into a prime (266880629) 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, 849782 + ... + 850095.

It is an arithmetic number, because the mean of its divisors is an integer number (67145181).

Almost surely, 2^266880689 is an apocalyptic number.

It is an amenable number.

266880689 is a deficient number, since it is larger than the sum of its proper divisors (1700035).

266880689 is a wasteful number, since it uses less digits than its factorization.

266880689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1700034.

The product of its (nonzero) digits is 1990656, while the sum is 53.

The square root of 266880689 is about 16336.4833731131. The cubic root of 266880689 is about 643.8317405992.

The spelling of 266880689 in words is "two hundred sixty-six million, eight hundred eighty thousand, six hundred eighty-nine".