25231613251 has 8 divisors (see below), whose sum is σ = 27242364240. Its totient is φ = 23230841952.

The previous prime is 25231613243. The next prime is 25231613261. The reversal of 25231613251 is 15231613252.

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 25231613251 - 2³ = 25231613243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25231613261) 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, 2489665 + ... + 2499778.

It is an arithmetic number, because the mean of its divisors is an integer number (3405295530).

Almost surely, 2^25231613251 is an apocalyptic number.

25231613251 is a deficient number, since it is larger than the sum of its proper divisors (2010750989).

25231613251 is a wasteful number, since it uses less digits than its factorization.

25231613251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4989845.

The product of its digits is 10800, while the sum is 31.

Subtracting from 25231613251 its reverse (15231613252), we obtain a palindrome (9999999999).

The spelling of 25231613251 in words is "twenty-five billion, two hundred thirty-one million, six hundred thirteen thousand, two hundred fifty-one".