26516256817 has 2 divisors, whose sum is σ = 26516256818. Its totient is φ = 26516256816.

The previous prime is 26516256803. The next prime is 26516256829. The reversal of 26516256817 is 71865261562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26450468496 + 65788321 = 162636^2 + 8111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26516256817 is a prime.

It is a super-2 number, since 2×26516256817² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (26516256857) 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, 13258128408 + 13258128409.

It is an arithmetic number, because the mean of its divisors is an integer number (13258128409).

Almost surely, 2^26516256817 is an apocalyptic number.

It is an amenable number.

26516256817 is a deficient number, since it is larger than the sum of its proper divisors (1).

26516256817 is an equidigital number, since it uses as much as digits as its factorization.

26516256817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1209600, while the sum is 49.

The spelling of 26516256817 in words is "twenty-six billion, five hundred sixteen million, two hundred fifty-six thousand, eight hundred seventeen".