26389669409 has 2 divisors, whose sum is σ = 26389669410. Its totient is φ = 26389669408.

The previous prime is 26389669403. The next prime is 26389669417. The reversal of 26389669409 is 90496698362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22470909409 + 3918760000 = 149903^2 + 62600^2 .

It is a cyclic number.

It is not a de Polignac number, because 26389669409 - 2¹⁶ = 26389603873 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (26389669403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13194834704 + 13194834705.

It is an arithmetic number, because the mean of its divisors is an integer number (13194834705).

Almost surely, 2^26389669409 is an apocalyptic number.

It is an amenable number.

26389669409 is a deficient number, since it is larger than the sum of its proper divisors (1).

26389669409 is an equidigital number, since it uses as much as digits as its factorization.

26389669409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30233088, while the sum is 62.

The spelling of 26389669409 in words is "twenty-six billion, three hundred eighty-nine million, six hundred sixty-nine thousand, four hundred nine".