25724543131117 has 2 divisors, whose sum is σ = 25724543131118. Its totient is φ = 25724543131116.

The previous prime is 25724543131087. The next prime is 25724543131141. The reversal of 25724543131117 is 71113134542752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22718130453316 + 3006412677801 = 4766354^2 + 1733901^2 .

It is a cyclic number.

It is not a de Polignac number, because 25724543131117 - 2⁷ = 25724543130989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25724543131187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12862271565558 + 12862271565559.

It is an arithmetic number, because the mean of its divisors is an integer number (12862271565559).

Almost surely, 2^{25724543131117} is an apocalyptic number.

It is an amenable number.

25724543131117 is a deficient number, since it is larger than the sum of its proper divisors (1).

25724543131117 is an equidigital number, since it uses as much as digits as its factorization.

25724543131117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 705600, while the sum is 46.

Adding to 25724543131117 its reverse (71113134542752), we get a palindrome (96837677673869).

The spelling of 25724543131117 in words is "twenty-five trillion, seven hundred twenty-four billion, five hundred forty-three million, one hundred thirty-one thousand, one hundred seventeen".