26206917491891 has 2 divisors, whose sum is σ = 26206917491892. Its totient is φ = 26206917491890.

The previous prime is 26206917491819. The next prime is 26206917491893. The reversal of 26206917491891 is 19819471960262.

Together with previous prime (26206917491819) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26206917491891 - 2¹⁰ = 26206917490867 is a prime.

Together with 26206917491893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26206917491893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13103458745945 + 13103458745946.

It is an arithmetic number, because the mean of its divisors is an integer number (13103458745946).

Almost surely, 2^{26206917491891} is an apocalyptic number.

26206917491891 is a deficient number, since it is larger than the sum of its proper divisors (1).

26206917491891 is an equidigital number, since it uses as much as digits as its factorization.

26206917491891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23514624, while the sum is 65.

The spelling of 26206917491891 in words is "twenty-six trillion, two hundred six billion, nine hundred seventeen million, four hundred ninety-one thousand, eight hundred ninety-one".