26864486917 has 2 divisors, whose sum is σ = 26864486918. Its totient is φ = 26864486916.

The previous prime is 26864486879. The next prime is 26864486923. The reversal of 26864486917 is 71968446862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14391841156 + 12472645761 = 119966^2 + 111681^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26864486917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26864486927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13432243458 + 13432243459.

It is an arithmetic number, because the mean of its divisors is an integer number (13432243459).

Almost surely, 2^26864486917 is an apocalyptic number.

It is an amenable number.

26864486917 is a deficient number, since it is larger than the sum of its proper divisors (1).

26864486917 is an equidigital number, since it uses as much as digits as its factorization.

26864486917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27869184, while the sum is 61.

The spelling of 26864486917 in words is "twenty-six billion, eight hundred sixty-four million, four hundred eighty-six thousand, nine hundred seventeen".