266526 has 48 divisors (see below), whose sum is σ = 668304. Its totient is φ = 76032.

The previous prime is 266521. The next prime is 266549. The reversal of 266526 is 625662.

266526 is a `hidden beast` number, since 2 + 6 + 652 + 6 = 666.

It is a super-2 number, since 2×266526² = 142072217352, which contains 22 as substring.

It is a Curzon number.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 266526.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266521) by changing a digit.

266526 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3945 + ... + 4011.

It is an arithmetic number, because the mean of its divisors is an integer number (13923).

2²⁶⁶⁵²⁶ is an apocalyptic number.

266526 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 266526, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (334152).

266526 is an abundant number, since it is smaller than the sum of its proper divisors (401778).

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

266526 is a wasteful number, since it uses less digits than its factorization.

266526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105 (or 102 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 266526 is about 516.2615616139. The cubic root of 266526 is about 64.3546393020.

The spelling of 266526 in words is "two hundred sixty-six thousand, five hundred twenty-six".