25644451545213 has 4 divisors (see below), whose sum is σ = 34192602060288. Its totient is φ = 17096301030140.

The previous prime is 25644451545203. The next prime is 25644451545283. The reversal of 25644451545213 is 31254515444652.

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 25644451545213 - 2²⁴ = 25644434767997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25644451545203) 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, 4274075257533 + ... + 4274075257538.

It is an arithmetic number, because the mean of its divisors is an integer number (8548150515072).

Almost surely, 2^{25644451545213} is an apocalyptic number.

It is an amenable number.

25644451545213 is a deficient number, since it is larger than the sum of its proper divisors (8548150515075).

25644451545213 is an equidigital number, since it uses as much as digits as its factorization.

25644451545213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8548150515074.

The product of its digits is 11520000, while the sum is 51.

Adding to 25644451545213 its reverse (31254515444652), we get a palindrome (56898966989865).

The spelling of 25644451545213 in words is "twenty-five trillion, six hundred forty-four billion, four hundred fifty-one million, five hundred forty-five thousand, two hundred thirteen".