266696669 has 2 divisors, whose sum is σ = 266696670. Its totient is φ = 266696668.

The previous prime is 266696657. The next prime is 266696671. The reversal of 266696669 is 966696662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223951225 + 42745444 = 14965^2 + 6538^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266696669 is a prime.

It is a super-2 number, since 2×266696669² = 142254226511391122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 266696671, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266696699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133348334 + 133348335.

It is an arithmetic number, because the mean of its divisors is an integer number (133348335).

Almost surely, 2^266696669 is an apocalyptic number.

It is an amenable number.

266696669 is a deficient number, since it is larger than the sum of its proper divisors (1).

266696669 is an equidigital number, since it uses as much as digits as its factorization.

266696669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7558272, while the sum is 56.

The square root of 266696669 is about 16330.8502228145. The cubic root of 266696669 is about 643.6837279438.

The spelling of 266696669 in words is "two hundred sixty-six million, six hundred ninety-six thousand, six hundred sixty-nine".