26905660897 has 2 divisors, whose sum is σ = 26905660898. Its totient is φ = 26905660896.

The previous prime is 26905660879. The next prime is 26905660907. The reversal of 26905660897 is 79806650962.

Together with previous prime (26905660879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25052874961 + 1852785936 = 158281^2 + 43044^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26905660897 is a prime.

It is not a weakly prime, because it can be changed into another prime (26905660807) 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, 13452830448 + 13452830449.

It is an arithmetic number, because the mean of its divisors is an integer number (13452830449).

Almost surely, 2^26905660897 is an apocalyptic number.

It is an amenable number.

26905660897 is a deficient number, since it is larger than the sum of its proper divisors (1).

26905660897 is an equidigital number, since it uses as much as digits as its factorization.

26905660897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9797760, while the sum is 58.

The spelling of 26905660897 in words is "twenty-six billion, nine hundred five million, six hundred sixty thousand, eight hundred ninety-seven".