26686267709 has 2 divisors, whose sum is σ = 26686267710. Its totient is φ = 26686267708.

The previous prime is 26686267691. The next prime is 26686267789. The reversal of 26686267709 is 90776268662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26087095225 + 599172484 = 161515^2 + 24478^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26686267709 is a prime.

It is a super-2 number, since 2×26686267709² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26686267789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13343133854 + 13343133855.

It is an arithmetic number, because the mean of its divisors is an integer number (13343133855).

Almost surely, 2^26686267709 is an apocalyptic number.

It is an amenable number.

26686267709 is a deficient number, since it is larger than the sum of its proper divisors (1).

26686267709 is an equidigital number, since it uses as much as digits as its factorization.

26686267709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18289152, while the sum is 59.

The spelling of 26686267709 in words is "twenty-six billion, six hundred eighty-six million, two hundred sixty-seven thousand, seven hundred nine".