266342393 has 2 divisors, whose sum is σ = 266342394. Its totient is φ = 266342392.

The previous prime is 266342347. The next prime is 266342411. The reversal of 266342393 is 393243662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142754704 + 123587689 = 11948^2 + 11117^2 .

It is a cyclic number.

It is not a de Polignac number, because 266342393 - 2⁸ = 266342137 is a prime.

It is not a weakly prime, because it can be changed into another prime (266342303) 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, 133171196 + 133171197.

It is an arithmetic number, because the mean of its divisors is an integer number (133171197).

Almost surely, 2^266342393 is an apocalyptic number.

It is an amenable number.

266342393 is a deficient number, since it is larger than the sum of its proper divisors (1).

266342393 is an equidigital number, since it uses as much as digits as its factorization.

266342393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 38.

The square root of 266342393 is about 16319.9997855392. Note that the first 3 decimals coincide. The cubic root of 266342393 is about 643.3985815918.

The spelling of 266342393 in words is "two hundred sixty-six million, three hundred forty-two thousand, three hundred ninety-three".