25945868161 has 8 divisors (see below), whose sum is σ = 27280564200. Its totient is φ = 24640506240.

The previous prime is 25945868149. The next prime is 25945868167. The reversal of 25945868161 is 16186854952.

It can be written as a sum of positive squares in 4 ways, for example, as 119771136 + 25826097025 = 10944^2 + 160705^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25945868161 - 2¹⁷ = 25945737089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25945868167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7331716 + ... + 7335253.

It is an arithmetic number, because the mean of its divisors is an integer number (3410070525).

Almost surely, 2^25945868161 is an apocalyptic number.

It is an amenable number.

25945868161 is a deficient number, since it is larger than the sum of its proper divisors (1334696039).

25945868161 is a wasteful number, since it uses less digits than its factorization.

25945868161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14667059.

The product of its digits is 4147200, while the sum is 55.

The spelling of 25945868161 in words is "twenty-five billion, nine hundred forty-five million, eight hundred sixty-eight thousand, one hundred sixty-one".