266223149 has 2 divisors, whose sum is σ = 266223150. Its totient is φ = 266223148.

The previous prime is 266223109. The next prime is 266223197. The reversal of 266223149 is 941322662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211906249 + 54316900 = 14557^2 + 7370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266223149 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266223109) 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, 133111574 + 133111575.

It is an arithmetic number, because the mean of its divisors is an integer number (133111575).

Almost surely, 2^266223149 is an apocalyptic number.

It is an amenable number.

266223149 is a deficient number, since it is larger than the sum of its proper divisors (1).

266223149 is an equidigital number, since it uses as much as digits as its factorization.

266223149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 35.

The square root of 266223149 is about 16316.3460676709. The cubic root of 266223149 is about 643.3025487222.

The spelling of 266223149 in words is "two hundred sixty-six million, two hundred twenty-three thousand, one hundred forty-nine".