25661457135317 has 2 divisors, whose sum is σ = 25661457135318. Its totient is φ = 25661457135316.

The previous prime is 25661457135253. The next prime is 25661457135389. The reversal of 25661457135317 is 71353175416652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15526823087281 + 10134634048036 = 3940409^2 + 3183494^2 .

It is a cyclic number.

It is not a de Polignac number, because 25661457135317 - 2⁶ = 25661457135253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25661457135397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12830728567658 + 12830728567659.

It is an arithmetic number, because the mean of its divisors is an integer number (12830728567659).

Almost surely, 2^{25661457135317} is an apocalyptic number.

It is an amenable number.

25661457135317 is a deficient number, since it is larger than the sum of its proper divisors (1).

25661457135317 is an equidigital number, since it uses as much as digits as its factorization.

25661457135317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876000, while the sum is 56.

The spelling of 25661457135317 in words is "twenty-five trillion, six hundred sixty-one billion, four hundred fifty-seven million, one hundred thirty-five thousand, three hundred seventeen".