25565881163 has 2 divisors, whose sum is σ = 25565881164. Its totient is φ = 25565881162.

The previous prime is 25565881153. The next prime is 25565881189. The reversal of 25565881163 is 36118856552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25565881163 - 2⁴ = 25565881147 is a prime.

It is a super-2 number, since 2×25565881163² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25565881153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12782940581 + 12782940582.

It is an arithmetic number, because the mean of its divisors is an integer number (12782940582).

Almost surely, 2^25565881163 is an apocalyptic number.

25565881163 is a deficient number, since it is larger than the sum of its proper divisors (1).

25565881163 is an equidigital number, since it uses as much as digits as its factorization.

25565881163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728000, while the sum is 50.

The spelling of 25565881163 in words is "twenty-five billion, five hundred sixty-five million, eight hundred eighty-one thousand, one hundred sixty-three".