25171250566541 has 2 divisors, whose sum is σ = 25171250566542. Its totient is φ = 25171250566540.

The previous prime is 25171250566513. The next prime is 25171250566703. The reversal of 25171250566541 is 14566505217152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14651639440516 + 10519611126025 = 3827746^2 + 3243395^2 .

It is a cyclic number.

It is not a de Polignac number, because 25171250566541 - 2¹⁴ = 25171250550157 is a prime.

It is a super-2 number, since 2×25171250566541² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25171250566541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25171250569541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12585625283270 + 12585625283271.

It is an arithmetic number, because the mean of its divisors is an integer number (12585625283271).

Almost surely, 2^{25171250566541} is an apocalyptic number.

It is an amenable number.

25171250566541 is a deficient number, since it is larger than the sum of its proper divisors (1).

25171250566541 is an equidigital number, since it uses as much as digits as its factorization.

25171250566541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520000, while the sum is 50.

The spelling of 25171250566541 in words is "twenty-five trillion, one hundred seventy-one billion, two hundred fifty million, five hundred sixty-six thousand, five hundred forty-one".