266686286549 has 2 divisors, whose sum is σ = 266686286550. Its totient is φ = 266686286548.

The previous prime is 266686286539. The next prime is 266686286639. The reversal of 266686286549 is 945682686662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 264453062500 + 2233224049 = 514250^2 + 47257^2 .

It is a cyclic number.

It is not a de Polignac number, because 266686286549 - 2⁴ = 266686286533 is a prime.

It is a super-2 number, since 2×266686286549² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266686286539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133343143274 + 133343143275.

It is an arithmetic number, because the mean of its divisors is an integer number (133343143275).

Almost surely, 2^266686286549 is an apocalyptic number.

It is an amenable number.

266686286549 is a deficient number, since it is larger than the sum of its proper divisors (1).

266686286549 is an equidigital number, since it uses as much as digits as its factorization.

266686286549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 358318080, while the sum is 68.

The spelling of 266686286549 in words is "two hundred sixty-six billion, six hundred eighty-six million, two hundred eighty-six thousand, five hundred forty-nine".