25540563 has 4 divisors (see below), whose sum is σ = 34054088. Its totient is φ = 17027040.

The previous prime is 25540549. The next prime is 25540591. The reversal of 25540563 is 36504552.

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

It is not a de Polignac number, because 25540563 - 2⁴ = 25540547 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 25540563.

It is not an unprimeable number, because it can be changed into a prime (25540513) 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, 4256758 + ... + 4256763.

It is an arithmetic number, because the mean of its divisors is an integer number (8513522).

Almost surely, 2^25540563 is an apocalyptic number.

25540563 is a deficient number, since it is larger than the sum of its proper divisors (8513525).

25540563 is an equidigital number, since it uses as much as digits as its factorization.

25540563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8513524.

The product of its (nonzero) digits is 18000, while the sum is 30.

The square root of 25540563 is about 5053.7672087266. The cubic root of 25540563 is about 294.4942517011.

The spelling of 25540563 in words is "twenty-five million, five hundred forty thousand, five hundred sixty-three".