25205023231 has 4 divisors (see below), whose sum is σ = 25206199200. Its totient is φ = 25203847264.

The previous prime is 25205023177. The next prime is 25205023267. The reversal of 25205023231 is 13232050252.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25205023231 - 2²⁷ = 25070805503 is a prime.

It is a super-2 number, since 2×25205023231² (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 = 25205023196 and 25205023205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25206023231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 555226 + ... + 598903.

It is an arithmetic number, because the mean of its divisors is an integer number (6301549800).

Almost surely, 2^25205023231 is an apocalyptic number.

25205023231 is a deficient number, since it is larger than the sum of its proper divisors (1175969).

25205023231 is a wasteful number, since it uses less digits than its factorization.

25205023231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175968.

The product of its (nonzero) digits is 3600, while the sum is 25.

Adding to 25205023231 its reverse (13232050252), we get a palindrome (38437073483).

The spelling of 25205023231 in words is "twenty-five billion, two hundred five million, twenty-three thousand, two hundred thirty-one".