25579882161 has 8 divisors (see below), whose sum is σ = 37896121760. Its totient is φ = 17053254756.

The previous prime is 25579882157. The next prime is 25579882189. The reversal of 25579882161 is 16128897552.

25579882161 is a `hidden beast` number, since 2 + 5 + 579 + 8 + 8 + 2 + 1 + 61 = 666.

It is not a de Polignac number, because 25579882161 - 2² = 25579882157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25579882098 and 25579882107.

It is not an unprimeable number, because it can be changed into a prime (25579882061) 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, 473701495 + ... + 473701548.

It is an arithmetic number, because the mean of its divisors is an integer number (4737015220).

Almost surely, 2^25579882161 is an apocalyptic number.

It is an amenable number.

25579882161 is a deficient number, since it is larger than the sum of its proper divisors (12316239599).

25579882161 is an equidigital number, since it uses as much as digits as its factorization.

25579882161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947403052 (or 947403046 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 54.

The spelling of 25579882161 in words is "twenty-five billion, five hundred seventy-nine million, eight hundred eighty-two thousand, one hundred sixty-one".