266643376706687 has 2 divisors, whose sum is σ = 266643376706688. Its totient is φ = 266643376706686.

The previous prime is 266643376706671. The next prime is 266643376706701. The reversal of 266643376706687 is 786607673346662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 266643376706687 - 2⁴ = 266643376706671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266643376706587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133321688353343 + 133321688353344.

It is an arithmetic number, because the mean of its divisors is an integer number (133321688353344).

Almost surely, 2^{266643376706687} is an apocalyptic number.

266643376706687 is a deficient number, since it is larger than the sum of its proper divisors (1).

266643376706687 is an equidigital number, since it uses as much as digits as its factorization.

266643376706687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9217732608, while the sum is 77.

The spelling of 266643376706687 in words is "two hundred sixty-six trillion, six hundred forty-three billion, three hundred seventy-six million, seven hundred six thousand, six hundred eighty-seven".