25041332521 has 4 divisors (see below), whose sum is σ = 25053437700. Its totient is φ = 25029227344.

The previous prime is 25041332497. The next prime is 25041332557. The reversal of 25041332521 is 12523314052.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6441828121 + 18599504400 = 80261^2 + 136380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25041332521 is a prime.

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 25041332521.

It is not an unprimeable number, because it can be changed into a prime (25041332581) 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, 6049486 + ... + 6053623.

It is an arithmetic number, because the mean of its divisors is an integer number (6263359425).

Almost surely, 2^25041332521 is an apocalyptic number.

It is an amenable number.

25041332521 is a deficient number, since it is larger than the sum of its proper divisors (12105179).

25041332521 is a wasteful number, since it uses less digits than its factorization.

25041332521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12105178.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 25041332521 its reverse (12523314052), we get a palindrome (37564646573).

The spelling of 25041332521 in words is "twenty-five billion, forty-one million, three hundred thirty-two thousand, five hundred twenty-one".