266747989 has 2 divisors, whose sum is σ = 266747990. Its totient is φ = 266747988.

The previous prime is 266747981. The next prime is 266748017. The reversal of 266747989 is 989747662.

266747989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168143089 + 98604900 = 12967^2 + 9930^2 .

It is a cyclic number.

It is not a de Polignac number, because 266747989 - 2³ = 266747981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266747981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133373994 + 133373995.

It is an arithmetic number, because the mean of its divisors is an integer number (133373995).

Almost surely, 2^266747989 is an apocalyptic number.

It is an amenable number.

266747989 is a deficient number, since it is larger than the sum of its proper divisors (1).

266747989 is an equidigital number, since it uses as much as digits as its factorization.

266747989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 58.

The square root of 266747989 is about 16332.4214065153. The cubic root of 266747989 is about 643.7250129617.

The spelling of 266747989 in words is "two hundred sixty-six million, seven hundred forty-seven thousand, nine hundred eighty-nine".