266663 has 2 divisors, whose sum is σ = 266664.
Its totient is φ = 266662.
The previous prime is 266647. The next prime is 266671. The reversal of 266663 is 366662.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 266663 - 24 = 266647 is a prime.
It is a super-2 number, since 2×2666632 = 142218311138, which contains 22 as substring.
It is a Sophie Germain prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (266603) by changing a digit.
It is a good prime.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133331 + 133332.
It is an arithmetic number, because the mean of its divisors is an integer number (133332).
2266663 is an apocalyptic number.
266663 is a deficient number, since it is larger than the sum of its proper divisors (1).
266663 is an equidigital number, since it uses as much as digits as its factorization.
266663 is an evil number, because the sum of its binary digits is even.
The product of its digits is 7776, while the sum is 29.
The square root of 266663 is about 516.3942292474.
The cubic root of 266663 is about 64.3656639617.
Subtracting 266663 from its reverse (366662), we obtain a palindrome (99999).
It can be divided in two parts, 266 and 663, that added together give a palindrome (929).
The spelling of 266663 in words is "two hundred sixty-six thousand, six hundred sixty-three".