266963 has 4 divisors (see below), whose sum is σ = 268320. Its totient is φ = 265608.

The previous prime is 266957. The next prime is 266971. The reversal of 266963 is 369662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 369662 = 2 ⋅184831.

It is a cyclic number.

It is not a de Polignac number, because 266963 - 2⁴ = 266947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266933) 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, 320 + ... + 797.

It is an arithmetic number, because the mean of its divisors is an integer number (67080).

2²⁶⁶⁹⁶³ is an apocalyptic number.

266963 is a deficient number, since it is larger than the sum of its proper divisors (1357).

266963 is a wasteful number, since it uses less digits than its factorization.

266963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356.

The product of its digits is 11664, while the sum is 32.

The square root of 266963 is about 516.6846233439. The cubic root of 266963 is about 64.3897923716.

The spelling of 266963 in words is "two hundred sixty-six thousand, nine hundred sixty-three".