26087870917 has 2 divisors, whose sum is σ = 26087870918. Its totient is φ = 26087870916.

The previous prime is 26087870849. The next prime is 26087870923. The reversal of 26087870917 is 71907878062.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24052597921 + 2035272996 = 155089^2 + 45114^2 .

It is a cyclic number.

It is not a de Polignac number, because 26087870917 - 2¹⁹ = 26087346629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26087870927) 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, 13043935458 + 13043935459.

It is an arithmetic number, because the mean of its divisors is an integer number (13043935459).

Almost surely, 2^26087870917 is an apocalyptic number.

It is an amenable number.

26087870917 is a deficient number, since it is larger than the sum of its proper divisors (1).

26087870917 is an equidigital number, since it uses as much as digits as its factorization.

26087870917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2370816, while the sum is 55.

The spelling of 26087870917 in words is "twenty-six billion, eighty-seven million, eight hundred seventy thousand, nine hundred seventeen".