26257866847 has 2 divisors, whose sum is σ = 26257866848. Its totient is φ = 26257866846.

The previous prime is 26257866781. The next prime is 26257866871. The reversal of 26257866847 is 74866875262.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26257866847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26257866347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13128933423 + 13128933424.

It is an arithmetic number, because the mean of its divisors is an integer number (13128933424).

Almost surely, 2^26257866847 is an apocalyptic number.

26257866847 is a deficient number, since it is larger than the sum of its proper divisors (1).

26257866847 is an equidigital number, since it uses as much as digits as its factorization.

26257866847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54190080, while the sum is 61.

The spelling of 26257866847 in words is "twenty-six billion, two hundred fifty-seven million, eight hundred sixty-six thousand, eight hundred forty-seven".