25561442231 has 32 divisors (see below), whose sum is σ = 28510906368. Its totient is φ = 22768542720.

The previous prime is 25561442213. The next prime is 25561442261. The reversal of 25561442231 is 13224416552.

It is a cyclic number.

It is not a de Polignac number, because 25561442231 - 2⁶ = 25561442167 is a prime.

It is a super-2 number, since 2×25561442231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25561442191 and 25561442200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25561442261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19616726 + ... + 19618028.

It is an arithmetic number, because the mean of its divisors is an integer number (890965824).

Almost surely, 2^25561442231 is an apocalyptic number.

25561442231 is a deficient number, since it is larger than the sum of its proper divisors (2949464137).

25561442231 is a wasteful number, since it uses less digits than its factorization.

25561442231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791.

The product of its digits is 57600, while the sum is 35.

Adding to 25561442231 its reverse (13224416552), we get a palindrome (38785858783).

The spelling of 25561442231 in words is "twenty-five billion, five hundred sixty-one million, four hundred forty-two thousand, two hundred thirty-one".