266249993 has 2 divisors, whose sum is σ = 266249994. Its totient is φ = 266249992.

The previous prime is 266249981. The next prime is 266250043. The reversal of 266249993 is 399942662.

It is an a-pointer prime, because the next prime (266250043) can be obtained adding 266249993 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 259757689 + 6492304 = 16117^2 + 2548^2 .

It is a cyclic number.

It is not a de Polignac number, because 266249993 - 2¹⁴ = 266233609 is a prime.

It is not a weakly prime, because it can be changed into another prime (266249293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133124996 + 133124997.

It is an arithmetic number, because the mean of its divisors is an integer number (133124997).

Almost surely, 2^266249993 is an apocalyptic number.

It is an amenable number.

266249993 is a deficient number, since it is larger than the sum of its proper divisors (1).

266249993 is an equidigital number, since it uses as much as digits as its factorization.

266249993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1259712, while the sum is 50.

The square root of 266249993 is about 16317.1686575827. The cubic root of 266249993 is about 643.3241699740.

The spelling of 266249993 in words is "two hundred sixty-six million, two hundred forty-nine thousand, nine hundred ninety-three".