25580538161 has 2 divisors, whose sum is σ = 25580538162. Its totient is φ = 25580538160.

The previous prime is 25580538157. The next prime is 25580538227. The reversal of 25580538161 is 16183508552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25574086561 + 6451600 = 159919^2 + 2540^2 .

It is a cyclic number.

It is not a de Polignac number, because 25580538161 - 2² = 25580538157 is a prime.

It is not a weakly prime, because it can be changed into another prime (25580538461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12790269080 + 12790269081.

It is an arithmetic number, because the mean of its divisors is an integer number (12790269081).

Almost surely, 2^25580538161 is an apocalyptic number.

It is an amenable number.

25580538161 is a deficient number, since it is larger than the sum of its proper divisors (1).

25580538161 is an equidigital number, since it uses as much as digits as its factorization.

25580538161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288000, while the sum is 44.

The spelling of 25580538161 in words is "twenty-five billion, five hundred eighty million, five hundred thirty-eight thousand, one hundred sixty-one".