25441325521 has 4 divisors (see below), whose sum is σ = 25441644544. Its totient is φ = 25441006500.

The previous prime is 25441325491. The next prime is 25441325561. The reversal of 25441325521 is 12552314452.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25441325521 - 2⁹ = 25441325009 is a prime.

It is a super-2 number, since 2×25441325521² (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 (25441325561) 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, 77416 + ... + 238486.

It is an arithmetic number, because the mean of its divisors is an integer number (6360411136).

Almost surely, 2^25441325521 is an apocalyptic number.

It is an amenable number.

25441325521 is a deficient number, since it is larger than the sum of its proper divisors (319023).

25441325521 is a wasteful number, since it uses less digits than its factorization.

25441325521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319022.

The product of its digits is 48000, while the sum is 34.

Adding to 25441325521 its reverse (12552314452), we get a palindrome (37993639973).

The spelling of 25441325521 in words is "twenty-five billion, four hundred forty-one million, three hundred twenty-five thousand, five hundred twenty-one".