266813 has 4 divisors (see below), whose sum is σ = 268128. Its totient is φ = 265500.

The previous prime is 266801. The next prime is 266821. The reversal of 266813 is 318662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 266813 - 2⁴ = 266797 is a prime.

It is a Duffinian number.

It is a plaindrome in base 3 and base 9.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266863) 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, 281 + ... + 782.

It is an arithmetic number, because the mean of its divisors is an integer number (67032).

2²⁶⁶⁸¹³ is an apocalyptic number.

It is an amenable number.

266813 is a deficient number, since it is larger than the sum of its proper divisors (1315).

266813 is a wasteful number, since it uses less digits than its factorization.

266813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1314.

The product of its digits is 1728, while the sum is 26.

The square root of 266813 is about 516.5394467028. The cubic root of 266813 is about 64.3777304274.

The spelling of 266813 in words is "two hundred sixty-six thousand, eight hundred thirteen".