266680587181 has 2 divisors, whose sum is σ = 266680587182. Its totient is φ = 266680587180.

The previous prime is 266680587167. The next prime is 266680587191. The reversal of 266680587181 is 181785086662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 264161049156 + 2519538025 = 513966^2 + 50195^2 .

It is a cyclic number.

It is not a de Polignac number, because 266680587181 - 2¹⁹ = 266680062893 is a prime.

It is a super-2 number, since 2×266680587181² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266680587191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133340293590 + 133340293591.

It is an arithmetic number, because the mean of its divisors is an integer number (133340293591).

Almost surely, 2^266680587181 is an apocalyptic number.

It is an amenable number.

266680587181 is a deficient number, since it is larger than the sum of its proper divisors (1).

266680587181 is an equidigital number, since it uses as much as digits as its factorization.

266680587181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7741440, while the sum is 58.

The spelling of 266680587181 in words is "two hundred sixty-six billion, six hundred eighty million, five hundred eighty-seven thousand, one hundred eighty-one".