266005 has 4 divisors (see below), whose sum is σ = 319212. Its totient is φ = 212800.

The previous prime is 266003. The next prime is 266009. The reversal of 266005 is 500662.

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 154449 + 111556 = 393^2 + 334^2 .

It is not a de Polignac number, because 266005 - 2¹ = 266003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266003) 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, 26596 + ... + 26605.

It is an arithmetic number, because the mean of its divisors is an integer number (79803).

2²⁶⁶⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

266005 is a deficient number, since it is larger than the sum of its proper divisors (53207).

266005 is an equidigital number, since it uses as much as digits as its factorization.

266005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53206.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 266005 is about 515.7567255984. The cubic root of 266005 is about 64.3126788704.

Adding to 266005 its reverse (500662), we get a palindrome (766667).

The spelling of 266005 in words is "two hundred sixty-six thousand, five".