266686286639 has 2 divisors, whose sum is σ = 266686286640. Its totient is φ = 266686286638.

The previous prime is 266686286549. The next prime is 266686286677. The reversal of 266686286639 is 936682686662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 266686286639 - 2²⁰ = 266685238063 is a prime.

It is a super-2 number, since 2×266686286639² (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 (266686286239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133343143319 + 133343143320.

It is an arithmetic number, because the mean of its divisors is an integer number (133343143320).

Almost surely, 2^266686286639 is an apocalyptic number.

266686286639 is a deficient number, since it is larger than the sum of its proper divisors (1).

266686286639 is an equidigital number, since it uses as much as digits as its factorization.

266686286639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322486272, while the sum is 68.

The spelling of 266686286639 in words is "two hundred sixty-six billion, six hundred eighty-six million, two hundred eighty-six thousand, six hundred thirty-nine".