266669 has 8 divisors (see below), whose sum is σ = 292152. Its totient is φ = 241920.

The previous prime is 266663. The next prime is 266671. The reversal of 266669 is 966662.

It can be written as a sum of positive squares in 4 ways, for example, as 26569 + 240100 = 163^2 + 490^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266669 is a prime.

It is a super-2 number, since 2×266669² = 142224711122, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266663) 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, 809 + ... + 1089.

It is an arithmetic number, because the mean of its divisors is an integer number (36519).

2²⁶⁶⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

266669 is a deficient number, since it is larger than the sum of its proper divisors (25483).

266669 is a wasteful number, since it uses less digits than its factorization.

266669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367.

The product of its digits is 23328, while the sum is 35.

The square root of 266669 is about 516.4000387297. The cubic root of 266669 is about 64.3661467072.

The spelling of 266669 in words is "two hundred sixty-six thousand, six hundred sixty-nine".