25353253531 has 4 divisors (see below), whose sum is σ = 25356536464. Its totient is φ = 25349970600.

The previous prime is 25353253529. The next prime is 25353253543. The reversal of 25353253531 is 13535235352.

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 25353253531 - 2¹ = 25353253529 is a prime.

It is a super-2 number, since 2×25353253531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25353253591) 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, 1629855 + ... + 1645336.

It is an arithmetic number, because the mean of its divisors is an integer number (6339134116).

Almost surely, 2^25353253531 is an apocalyptic number.

25353253531 is a deficient number, since it is larger than the sum of its proper divisors (3282933).

25353253531 is an equidigital number, since it uses as much as digits as its factorization.

25353253531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3282932.

The product of its digits is 202500, while the sum is 37.

Adding to 25353253531 its reverse (13535235352), we get a palindrome (38888488883).

The spelling of 25353253531 in words is "twenty-five billion, three hundred fifty-three million, two hundred fifty-three thousand, five hundred thirty-one".