266686286687 has 2 divisors, whose sum is σ = 266686286688. Its totient is φ = 266686286686.

The previous prime is 266686286677. The next prime is 266686286717. The reversal of 266686286687 is 786682686662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 266686286687 - 2⁸ = 266686286431 is a prime.

It is a super-2 number, since 2×266686286687² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 266686286687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266686286677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133343143343 + 133343143344.

It is an arithmetic number, because the mean of its divisors is an integer number (133343143344).

Almost surely, 2^266686286687 is an apocalyptic number.

266686286687 is a deficient number, since it is larger than the sum of its proper divisors (1).

266686286687 is an equidigital number, since it uses as much as digits as its factorization.

266686286687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 668860416, while the sum is 71.

The spelling of 266686286687 in words is "two hundred sixty-six billion, six hundred eighty-six million, two hundred eighty-six thousand, six hundred eighty-seven".