25413254521 has 4 divisors (see below), whose sum is σ = 25953962112. Its totient is φ = 24872546932.

The previous prime is 25413254519. The next prime is 25413254539. The reversal of 25413254521 is 12545231452.

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.

It is a cyclic number.

It is not a de Polignac number, because 25413254521 - 2¹ = 25413254519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25413254561) 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, 270353725 + ... + 270353818.

It is an arithmetic number, because the mean of its divisors is an integer number (6488490528).

Almost surely, 2^25413254521 is an apocalyptic number.

It is an amenable number.

25413254521 is a deficient number, since it is larger than the sum of its proper divisors (540707591).

25413254521 is an equidigital number, since it uses as much as digits as its factorization.

25413254521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540707590.

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

Adding to 25413254521 its reverse (12545231452), we get a palindrome (37958485973).

The spelling of 25413254521 in words is "twenty-five billion, four hundred thirteen million, two hundred fifty-four thousand, five hundred twenty-one".