266993 has 2 divisors, whose sum is σ = 266994. Its totient is φ = 266992.

The previous prime is 266983. The next prime is 266999. The reversal of 266993 is 399662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223729 + 43264 = 473^2 + 208^2 .

It is a cyclic number.

It is not a de Polignac number, because 266993 - 2⁴ = 266977 is a prime.

It is not a weakly prime, because it can be changed into another prime (266999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133496 + 133497.

It is an arithmetic number, because the mean of its divisors is an integer number (133497).

2²⁶⁶⁹⁹³ is an apocalyptic number.

It is an amenable number.

266993 is a deficient number, since it is larger than the sum of its proper divisors (1).

266993 is an equidigital number, since it uses as much as digits as its factorization.

266993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 35.

The square root of 266993 is about 516.7136537774. The cubic root of 266993 is about 64.3922042182.

The spelling of 266993 in words is "two hundred sixty-six thousand, nine hundred ninety-three".