25878281717 has 2 divisors, whose sum is σ = 25878281718. Its totient is φ = 25878281716.

The previous prime is 25878281701. The next prime is 25878281791. The reversal of 25878281717 is 71718287852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17413177681 + 8465104036 = 131959^2 + 92006^2 .

It is a cyclic number.

It is not a de Polignac number, because 25878281717 - 2⁴ = 25878281701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25878281417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12939140858 + 12939140859.

It is an arithmetic number, because the mean of its divisors is an integer number (12939140859).

Almost surely, 2^25878281717 is an apocalyptic number.

It is an amenable number.

25878281717 is a deficient number, since it is larger than the sum of its proper divisors (1).

25878281717 is an equidigital number, since it uses as much as digits as its factorization.

25878281717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3512320, while the sum is 56.

The spelling of 25878281717 in words is "twenty-five billion, eight hundred seventy-eight million, two hundred eighty-one thousand, seven hundred seventeen".