26897617897 has 2 divisors, whose sum is σ = 26897617898. Its totient is φ = 26897617896.

The previous prime is 26897617853. The next prime is 26897617951. The reversal of 26897617897 is 79871679862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16574245081 + 10323372816 = 128741^2 + 101604^2 .

It is a cyclic number.

It is not a de Polignac number, because 26897617897 - 2³¹ = 24750134249 is a prime.

It is not a weakly prime, because it can be changed into another prime (26897617847) 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, 13448808948 + 13448808949.

It is an arithmetic number, because the mean of its divisors is an integer number (13448808949).

Almost surely, 2^26897617897 is an apocalyptic number.

It is an amenable number.

26897617897 is a deficient number, since it is larger than the sum of its proper divisors (1).

26897617897 is an equidigital number, since it uses as much as digits as its factorization.

26897617897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 128024064, while the sum is 70.

The spelling of 26897617897 in words is "twenty-six billion, eight hundred ninety-seven million, six hundred seventeen thousand, eight hundred ninety-seven".