266666663663 has 2 divisors, whose sum is σ = 266666663664. Its totient is φ = 266666663662.

The previous prime is 266666663657. The next prime is 266666663689. The reversal of 266666663663 is 366366666662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 266666663663 - 2¹⁴ = 266666647279 is a prime.

It is a super-2 number, since 2×266666663663² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 266666663596 and 266666663605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266666663633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133333331831 + 133333331832.

It is an arithmetic number, because the mean of its divisors is an integer number (133333331832).

Almost surely, 2^266666663663 is an apocalyptic number.

266666663663 is a deficient number, since it is larger than the sum of its proper divisors (1).

266666663663 is an equidigital number, since it uses as much as digits as its factorization.

266666663663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181398528, while the sum is 62.

The spelling of 266666663663 in words is "two hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-three thousand, six hundred sixty-three".