26681788849 has 2 divisors, whose sum is σ = 26681788850. Its totient is φ = 26681788848.

The previous prime is 26681788843. The next prime is 26681788879. The reversal of 26681788849 is 94888718662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24084867249 + 2596921600 = 155193^2 + 50960^2 .

It is a cyclic number.

It is not a de Polignac number, because 26681788849 - 2²⁷ = 26547571121 is a prime.

It is not a weakly prime, because it can be changed into another prime (26681788843) 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, 13340894424 + 13340894425.

It is an arithmetic number, because the mean of its divisors is an integer number (13340894425).

Almost surely, 2^26681788849 is an apocalyptic number.

It is an amenable number.

26681788849 is a deficient number, since it is larger than the sum of its proper divisors (1).

26681788849 is an equidigital number, since it uses as much as digits as its factorization.

26681788849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 74317824, while the sum is 67.

The spelling of 26681788849 in words is "twenty-six billion, six hundred eighty-one million, seven hundred eighty-eight thousand, eight hundred forty-nine".