266605 has 8 divisors (see below), whose sum is σ = 324864. Its totient is φ = 210000.

The previous prime is 266603. The next prime is 266633. The reversal of 266605 is 506662.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 266605 - 2¹ = 266603 is a prime.

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 266605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21 + ... + 730.

It is an arithmetic number, because the mean of its divisors is an integer number (40608).

2²⁶⁶⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

266605 is a deficient number, since it is larger than the sum of its proper divisors (58259).

266605 is an equidigital number, since it uses as much as digits as its factorization.

266605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827.

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

The square root of 266605 is about 516.3380675488. The cubic root of 266605 is about 64.3609970485.

The spelling of 266605 in words is "two hundred sixty-six thousand, six hundred five".