266649 has 4 divisors (see below), whose sum is σ = 355536. Its totient is φ = 177764.

The previous prime is 266647. The next prime is 266663. The reversal of 266649 is 946662.

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 266649 - 2¹ = 266647 is a prime.

It is a super-2 number, since 2×266649² = 142203378402, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2¹¹ + 6³ + 6³ + 6⁴ + 4⁹ + 9³ .

It is a D-number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 266649.

It is not an unprimeable number, because it can be changed into a prime (266641) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 44439 + ... + 44444.

It is an arithmetic number, because the mean of its divisors is an integer number (88884).

2²⁶⁶⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

266649 is a deficient number, since it is larger than the sum of its proper divisors (88887).

266649 is an equidigital number, since it uses as much as digits as its factorization.

266649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88886.

The product of its digits is 15552, while the sum is 33.

The square root of 266649 is about 516.3806735346. The cubic root of 266649 is about 64.3645375274.

The spelling of 266649 in words is "two hundred sixty-six thousand, six hundred forty-nine".