26662366009 has 2 divisors, whose sum is σ = 26662366010. Its totient is φ = 26662366008.

The previous prime is 26662365979. The next prime is 26662366099. The reversal of 26662366009 is 90066326662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15710115600 + 10952250409 = 125340^2 + 104653^2 .

It is a cyclic number.

It is not a de Polignac number, because 26662366009 - 2¹¹ = 26662363961 is a prime.

It is a super-2 number, since 2×26662366009² (a number of 22 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 26662366009.

It is not a weakly prime, because it can be changed into another prime (26662366099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13331183004 + 13331183005.

It is an arithmetic number, because the mean of its divisors is an integer number (13331183005).

Almost surely, 2^26662366009 is an apocalyptic number.

It is an amenable number.

26662366009 is a deficient number, since it is larger than the sum of its proper divisors (1).

26662366009 is an equidigital number, since it uses as much as digits as its factorization.

26662366009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 46.

The spelling of 26662366009 in words is "twenty-six billion, six hundred sixty-two million, three hundred sixty-six thousand, nine".