26526607781897 has 2 divisors, whose sum is σ = 26526607781898. Its totient is φ = 26526607781896.

The previous prime is 26526607781753. The next prime is 26526607781917. The reversal of 26526607781897 is 79818770662562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18251872272841 + 8274735509056 = 4272221^2 + 2876584^2 .

It is a cyclic number.

It is not a de Polignac number, because 26526607781897 - 2²⁶ = 26526540673033 is a prime.

It is not a weakly prime, because it can be changed into another prime (26520607781897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13263303890948 + 13263303890949.

It is an arithmetic number, because the mean of its divisors is an integer number (13263303890949).

Almost surely, 2^{26526607781897} is an apocalyptic number.

It is an amenable number.

26526607781897 is a deficient number, since it is larger than the sum of its proper divisors (1).

26526607781897 is an equidigital number, since it uses as much as digits as its factorization.

26526607781897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 853493760, while the sum is 74.

The spelling of 26526607781897 in words is "twenty-six trillion, five hundred twenty-six billion, six hundred seven million, seven hundred eighty-one thousand, eight hundred ninety-seven".