26809798909 has 2 divisors, whose sum is σ = 26809798910. Its totient is φ = 26809798908.

The previous prime is 26809798903. The next prime is 26809798943. The reversal of 26809798909 is 90989790862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21534682009 + 5275116900 = 146747^2 + 72630^2 .

It is a cyclic number.

It is not a de Polignac number, because 26809798909 - 2⁵ = 26809798877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26809798903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13404899454 + 13404899455.

It is an arithmetic number, because the mean of its divisors is an integer number (13404899455).

Almost surely, 2^26809798909 is an apocalyptic number.

It is an amenable number.

26809798909 is a deficient number, since it is larger than the sum of its proper divisors (1).

26809798909 is an equidigital number, since it uses as much as digits as its factorization.

26809798909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35271936, while the sum is 67.

The spelling of 26809798909 in words is "twenty-six billion, eight hundred nine million, seven hundred ninety-eight thousand, nine hundred nine".