266904689 has 2 divisors, whose sum is σ = 266904690. Its totient is φ = 266904688.

The previous prime is 266904683. The next prime is 266904697. The reversal of 266904689 is 986409662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141800464 + 125104225 = 11908^2 + 11185^2 .

It is a cyclic number.

It is not a de Polignac number, because 266904689 - 2²⁴ = 250127473 is a prime.

It is a super-2 number, since 2×266904689² = 142476226020373442, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (266904683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133452344 + 133452345.

It is an arithmetic number, because the mean of its divisors is an integer number (133452345).

Almost surely, 2^266904689 is an apocalyptic number.

It is an amenable number.

266904689 is a deficient number, since it is larger than the sum of its proper divisors (1).

266904689 is an equidigital number, since it uses as much as digits as its factorization.

266904689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 50.

The square root of 266904689 is about 16337.2179088118. The cubic root of 266904689 is about 643.8510394835.

The spelling of 266904689 in words is "two hundred sixty-six million, nine hundred four thousand, six hundred eighty-nine".