25565221344541 has 4 divisors (see below), whose sum is σ = 25572380469184. Its totient is φ = 25558062219900.

The previous prime is 25565221344539. The next prime is 25565221344569. The reversal of 25565221344541 is 14544312256552.

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 25565221344541 - 2¹ = 25565221344539 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25565221342541) 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, 3579556965 + ... + 3579564106.

It is an arithmetic number, because the mean of its divisors is an integer number (6393095117296).

Almost surely, 2^{25565221344541} is an apocalyptic number.

It is an amenable number.

25565221344541 is a deficient number, since it is larger than the sum of its proper divisors (7159124643).

25565221344541 is an equidigital number, since it uses as much as digits as its factorization.

25565221344541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7159124642.

The product of its digits is 5760000, while the sum is 49.

The spelling of 25565221344541 in words is "twenty-five trillion, five hundred sixty-five billion, two hundred twenty-one million, three hundred forty-four thousand, five hundred forty-one".