266560 has 84 divisors (see below), whose sum is σ = 781812. Its totient is φ = 86016.

The previous prime is 266549. The next prime is 266587. The reversal of 266560 is 65662.

It can be written as a sum of positive squares in 2 ways, for example, as 153664 + 112896 = 392^2 + 336^2 .

It is a plaindrome in base 9.

It is a zygodrome in base 9.

It is a congruent number.

It is an unprimeable number.

266560 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15672 + ... + 15688.

2²⁶⁶⁵⁶⁰ is an apocalyptic number.

266560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (390906).

266560 is an abundant number, since it is smaller than the sum of its proper divisors (515252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266560 is a wasteful number, since it uses less digits than its factorization.

266560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48 (or 31 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 266560 is about 516.2944896084. The cubic root of 266560 is about 64.3573757013.

The spelling of 266560 in words is "two hundred sixty-six thousand, five hundred sixty".