266316454450181 has 2 divisors, whose sum is σ = 266316454450182. Its totient is φ = 266316454450180.

The previous prime is 266316454450177. The next prime is 266316454450217. The reversal of 266316454450181 is 181054454613662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194651188545025 + 71665265905156 = 13951745^2 + 8465534^2 .

It is a cyclic number.

It is not a de Polignac number, because 266316454450181 - 2² = 266316454450177 is a prime.

It is a super-2 number, since 2×266316454450181² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266316414450181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133158227225090 + 133158227225091.

It is an arithmetic number, because the mean of its divisors is an integer number (133158227225091).

Almost surely, 2^{266316454450181} is an apocalyptic number.

It is an amenable number.

266316454450181 is a deficient number, since it is larger than the sum of its proper divisors (1).

266316454450181 is an equidigital number, since it uses as much as digits as its factorization.

266316454450181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16588800, while the sum is 56.

The spelling of 266316454450181 in words is "two hundred sixty-six trillion, three hundred sixteen billion, four hundred fifty-four million, four hundred fifty thousand, one hundred eighty-one".