25989870161 has 2 divisors, whose sum is σ = 25989870162. Its totient is φ = 25989870160.

The previous prime is 25989870143. The next prime is 25989870197. The reversal of 25989870161 is 16107898952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25980604225 + 9265936 = 161185^2 + 3044^2 .

It is a cyclic number.

It is not a de Polignac number, because 25989870161 - 2¹⁴ = 25989853777 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25989870097 and 25989870106.

It is not a weakly prime, because it can be changed into another prime (25989870961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12994935080 + 12994935081.

It is an arithmetic number, because the mean of its divisors is an integer number (12994935081).

Almost surely, 2^25989870161 is an apocalyptic number.

It is an amenable number.

25989870161 is a deficient number, since it is larger than the sum of its proper divisors (1).

25989870161 is an equidigital number, since it uses as much as digits as its factorization.

25989870161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2177280, while the sum is 56.

The spelling of 25989870161 in words is "twenty-five billion, nine hundred eighty-nine million, eight hundred seventy thousand, one hundred sixty-one".