25570858717 has 2 divisors, whose sum is σ = 25570858718. Its totient is φ = 25570858716.

The previous prime is 25570858699. The next prime is 25570858727. The reversal of 25570858717 is 71785807552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25555539321 + 15319396 = 159861^2 + 3914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25570858717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25570858727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12785429358 + 12785429359.

It is an arithmetic number, because the mean of its divisors is an integer number (12785429359).

Almost surely, 2^25570858717 is an apocalyptic number.

It is an amenable number.

25570858717 is a deficient number, since it is larger than the sum of its proper divisors (1).

25570858717 is an equidigital number, since it uses as much as digits as its factorization.

25570858717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5488000, while the sum is 55.

The spelling of 25570858717 in words is "twenty-five billion, five hundred seventy million, eight hundred fifty-eight thousand, seven hundred seventeen".