25564543 has 4 divisors (see below), whose sum is σ = 25652088. Its totient is φ = 25477000.

The previous prime is 25564541. The next prime is 25564559. The reversal of 25564543 is 34546552.

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

It is a cyclic number.

It is not a de Polignac number, because 25564543 - 2¹ = 25564541 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25564499 and 25564508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25564541) 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, 43333 + ... + 43918.

It is an arithmetic number, because the mean of its divisors is an integer number (6413022).

Almost surely, 2^25564543 is an apocalyptic number.

25564543 is a deficient number, since it is larger than the sum of its proper divisors (87545).

25564543 is an equidigital number, since it uses as much as digits as its factorization.

25564543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87544.

The product of its digits is 72000, while the sum is 34.

The square root of 25564543 is about 5056.1391396994. The cubic root of 25564543 is about 294.5863896224.

Subtracting 25564543 from its reverse (34546552), we obtain a square (8982009 = 2997²).

The spelling of 25564543 in words is "twenty-five million, five hundred sixty-four thousand, five hundred forty-three".