25523413563 has 4 divisors (see below), whose sum is σ = 34031218088. Its totient is φ = 17015609040.

The previous prime is 25523413529. The next prime is 25523413577. The reversal of 25523413563 is 36531432552.

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

It is not a de Polignac number, because 25523413563 - 2²¹ = 25521316411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25523413523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4253902258 + ... + 4253902263.

It is an arithmetic number, because the mean of its divisors is an integer number (8507804522).

Almost surely, 2^25523413563 is an apocalyptic number.

25523413563 is a deficient number, since it is larger than the sum of its proper divisors (8507804525).

25523413563 is an equidigital number, since it uses as much as digits as its factorization.

25523413563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8507804524.

The product of its digits is 324000, while the sum is 39.

The spelling of 25523413563 in words is "twenty-five billion, five hundred twenty-three million, four hundred thirteen thousand, five hundred sixty-three".