266666666663 has 2 divisors, whose sum is σ = 266666666664. Its totient is φ = 266666666662.

The previous prime is 266666666611. The next prime is 266666666711. The reversal of 266666666663 is 366666666662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 266666666663 - 2¹⁸ = 266666404519 is a prime.

It is a super-2 number, since 2×266666666663² (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 266666666663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266666663663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133333333331 + 133333333332.

It is an arithmetic number, because the mean of its divisors is an integer number (133333333332).

Almost surely, 2^266666666663 is an apocalyptic number.

266666666663 is a deficient number, since it is larger than the sum of its proper divisors (1).

266666666663 is an equidigital number, since it uses as much as digits as its factorization.

266666666663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362797056, while the sum is 65.

Subtracting 266666666663 from its reverse (366666666662), we obtain a palindrome (99999999999).

The spelling of 266666666663 in words is "two hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-three".