25538751412217 has 2 divisors, whose sum is σ = 25538751412218. Its totient is φ = 25538751412216.

The previous prime is 25538751412159. The next prime is 25538751412247. The reversal of 25538751412217 is 71221415783552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17778231347776 + 7760520064441 = 4216424^2 + 2785771^2 .

It is a cyclic number.

It is not a de Polignac number, because 25538751412217 - 2⁸ = 25538751411961 is a prime.

It is not a weakly prime, because it can be changed into another prime (25538751412247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12769375706108 + 12769375706109.

It is an arithmetic number, because the mean of its divisors is an integer number (12769375706109).

Almost surely, 2^{25538751412217} is an apocalyptic number.

It is an amenable number.

25538751412217 is a deficient number, since it is larger than the sum of its proper divisors (1).

25538751412217 is an equidigital number, since it uses as much as digits as its factorization.

25538751412217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704000, while the sum is 53.

The spelling of 25538751412217 in words is "twenty-five trillion, five hundred thirty-eight billion, seven hundred fifty-one million, four hundred twelve thousand, two hundred seventeen".