25448863729 has 9 divisors (see below), whose sum is σ = 25845221451. Its totient is φ = 25058501160.

The previous prime is 25448863651. The next prime is 25448863747. The reversal of 25448863729 is 92736884452.

It is a happy number.

The square root of 25448863729 is 159527.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 21372129 + 25427491600 = 4623^2 + 159460^2 .

It is not a de Polignac number, because 25448863729 - 2²¹ = 25446766577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25448863799) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10687119 + ... + 10689499.

Almost surely, 2^25448863729 is an apocalyptic number.

25448863729 is the 159527-th square number.

25448863729 is the 79764-th centered octagonal number.

It is an amenable number.

25448863729 is a deficient number, since it is larger than the sum of its proper divisors (396357722).

25448863729 is an frugal number, since it uses more digits than its factorization.

25448863729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4896 (or 2448 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 58.

The spelling of 25448863729 in words is "twenty-five billion, four hundred forty-eight million, eight hundred sixty-three thousand, seven hundred twenty-nine".