266320993 has 2 divisors, whose sum is σ = 266320994. Its totient is φ = 266320992.

The previous prime is 266320991. The next prime is 266321017. The reversal of 266320993 is 399023662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157577809 + 108743184 = 12553^2 + 10428^2 .

It is a cyclic number.

It is not a de Polignac number, because 266320993 - 2¹ = 266320991 is a prime.

Together with 266320991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (266320991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133160496 + 133160497.

It is an arithmetic number, because the mean of its divisors is an integer number (133160497).

Almost surely, 2^266320993 is an apocalyptic number.

It is an amenable number.

266320993 is a deficient number, since it is larger than the sum of its proper divisors (1).

266320993 is an equidigital number, since it uses as much as digits as its factorization.

266320993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 40.

The square root of 266320993 is about 16319.3441351054. The cubic root of 266320993 is about 643.3813492638.

The spelling of 266320993 in words is "two hundred sixty-six million, three hundred twenty thousand, nine hundred ninety-three".