266664440407913 has 2 divisors, whose sum is σ = 266664440407914. Its totient is φ = 266664440407912.

The previous prime is 266664440407907. The next prime is 266664440407931. The reversal of 266664440407913 is 319704044466662.

Together with next prime (266664440407931) 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., 266523517500304 + 140922907609 = 16325548^2 + 375397^2 .

It is a cyclic number.

It is not a de Polignac number, because 266664440407913 - 2¹⁴ = 266664440391529 is a prime.

It is a super-2 number, since 2×266664440407913² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (266664440407993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133332220203956 + 133332220203957.

It is an arithmetic number, because the mean of its divisors is an integer number (133332220203957).

Almost surely, 2^{266664440407913} is an apocalyptic number.

It is an amenable number.

266664440407913 is a deficient number, since it is larger than the sum of its proper divisors (1).

266664440407913 is an equidigital number, since it uses as much as digits as its factorization.

266664440407913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 125411328, while the sum is 62.

The spelling of 266664440407913 in words is "two hundred sixty-six trillion, six hundred sixty-four billion, four hundred forty million, four hundred seven thousand, nine hundred thirteen".