25448115531 has 4 divisors (see below), whose sum is σ = 33930820712. Its totient is φ = 16965410352.

The previous prime is 25448115529. The next prime is 25448115547. The reversal of 25448115531 is 13551184452.

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

It is not a de Polignac number, because 25448115531 - 2¹ = 25448115529 is a prime.

It is a super-2 number, since 2×25448115531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25448115531.

It is not an unprimeable number, because it can be changed into a prime (25448115551) 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, 4241352586 + ... + 4241352591.

It is an arithmetic number, because the mean of its divisors is an integer number (8482705178).

Almost surely, 2^25448115531 is an apocalyptic number.

25448115531 is a deficient number, since it is larger than the sum of its proper divisors (8482705181).

25448115531 is an equidigital number, since it uses as much as digits as its factorization.

25448115531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8482705180.

The product of its digits is 96000, while the sum is 39.

Adding to 25448115531 its reverse (13551184452), we get a palindrome (38999299983).

The spelling of 25448115531 in words is "twenty-five billion, four hundred forty-eight million, one hundred fifteen thousand, five hundred thirty-one".