25555505317 has 2 divisors, whose sum is σ = 25555505318. Its totient is φ = 25555505316.

The previous prime is 25555505237. The next prime is 25555505341. The reversal of 25555505317 is 71350555552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24226611201 + 1328894116 = 155649^2 + 36454^2 .

It is a cyclic number.

It is not a de Polignac number, because 25555505317 - 2¹⁹ = 25554981029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25555505347) 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, 12777752658 + 12777752659.

It is an arithmetic number, because the mean of its divisors is an integer number (12777752659).

Almost surely, 2^25555505317 is an apocalyptic number.

It is an amenable number.

25555505317 is a deficient number, since it is larger than the sum of its proper divisors (1).

25555505317 is an equidigital number, since it uses as much as digits as its factorization.

25555505317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 656250, while the sum is 43.

The spelling of 25555505317 in words is "twenty-five billion, five hundred fifty-five million, five hundred five thousand, three hundred seventeen".