266707981 has 2 divisors, whose sum is σ = 266707982. Its totient is φ = 266707980.

The previous prime is 266707979. The next prime is 266708077. The reversal of 266707981 is 189707662.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 232074756 + 34633225 = 15234^2 + 5885^2 .

It is a cyclic number.

It is not a de Polignac number, because 266707981 - 2¹ = 266707979 is a prime.

It is a super-2 number, since 2×266707981² = 142266294258192722, which contains 22 as substring.

Together with 266707979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266707381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133353990 + 133353991.

It is an arithmetic number, because the mean of its divisors is an integer number (133353991).

Almost surely, 2^266707981 is an apocalyptic number.

It is an amenable number.

266707981 is a deficient number, since it is larger than the sum of its proper divisors (1).

266707981 is an equidigital number, since it uses as much as digits as its factorization.

266707981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 266707981 is about 16331.1965575092. The cubic root of 266707981 is about 643.6928284792.

The spelling of 266707981 in words is "two hundred sixty-six million, seven hundred seven thousand, nine hundred eighty-one".