26501256917 has 2 divisors, whose sum is σ = 26501256918. Its totient is φ = 26501256916.

The previous prime is 26501256911. The next prime is 26501256931. The reversal of 26501256917 is 71965210562.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25434189361 + 1067067556 = 159481^2 + 32666^2 .

It is a cyclic number.

It is not a de Polignac number, because 26501256917 - 2¹⁴ = 26501240533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26501256911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13250628458 + 13250628459.

It is an arithmetic number, because the mean of its divisors is an integer number (13250628459).

Almost surely, 2^26501256917 is an apocalyptic number.

It is an amenable number.

26501256917 is a deficient number, since it is larger than the sum of its proper divisors (1).

26501256917 is an equidigital number, since it uses as much as digits as its factorization.

26501256917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 44.

The spelling of 26501256917 in words is "twenty-six billion, five hundred one million, two hundred fifty-six thousand, nine hundred seventeen".