26866684069 has 2 divisors, whose sum is σ = 26866684070. Its totient is φ = 26866684068.

The previous prime is 26866684027. The next prime is 26866684109. The reversal of 26866684069 is 96048666862.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21804361569 + 5062322500 = 147663^2 + 71150^2 .

It is a cyclic number.

It is not a de Polignac number, because 26866684069 - 2¹¹ = 26866682021 is a prime.

It is a super-2 number, since 2×26866684069² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 26866683998 and 26866684016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26866682069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13433342034 + 13433342035.

It is an arithmetic number, because the mean of its divisors is an integer number (13433342035).

Almost surely, 2^26866684069 is an apocalyptic number.

It is an amenable number.

26866684069 is a deficient number, since it is larger than the sum of its proper divisors (1).

26866684069 is an equidigital number, since it uses as much as digits as its factorization.

26866684069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35831808, while the sum is 61.

The spelling of 26866684069 in words is "twenty-six billion, eight hundred sixty-six million, six hundred eighty-four thousand, sixty-nine".