266661045226397 has 2 divisors, whose sum is σ = 266661045226398. Its totient is φ = 266661045226396.

The previous prime is 266661045226379. The next prime is 266661045226421. The reversal of 266661045226397 is 793622540166662.

Together with previous prime (266661045226379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152828661787321 + 113832383439076 = 12362389^2 + 10669226^2 .

It is a cyclic number.

It is not a de Polignac number, because 266661045226397 - 2⁸ = 266661045226141 is a prime.

It is a super-2 number, since 2×266661045226397² (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 (266661045226327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133330522613198 + 133330522613199.

It is an arithmetic number, because the mean of its divisors is an integer number (133330522613199).

Almost surely, 2^{266661045226397} is an apocalyptic number.

It is an amenable number.

266661045226397 is a deficient number, since it is larger than the sum of its proper divisors (1).

266661045226397 is an equidigital number, since it uses as much as digits as its factorization.

266661045226397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 235146240, while the sum is 65.

The spelling of 266661045226397 in words is "two hundred sixty-six trillion, six hundred sixty-one billion, forty-five million, two hundred twenty-six thousand, three hundred ninety-seven".