25520045 has 4 divisors (see below), whose sum is σ = 30624060. Its totient is φ = 20416032.

The previous prime is 25520017. The next prime is 25520051. The reversal of 25520045 is 54002552.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3118756 + 22401289 = 1766^2 + 4733^2 .

It is a cyclic number.

It is not a de Polignac number, because 25520045 - 2⁶ = 25519981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25520045.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2552000 + ... + 2552009.

It is an arithmetic number, because the mean of its divisors is an integer number (7656015).

Almost surely, 2^25520045 is an apocalyptic number.

It is an amenable number.

25520045 is a deficient number, since it is larger than the sum of its proper divisors (5104015).

25520045 is an equidigital number, since it uses as much as digits as its factorization.

25520045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5104014.

The product of its (nonzero) digits is 2000, while the sum is 23.

The square root of 25520045 is about 5051.7368300417. The cubic root of 25520045 is about 294.4153699652.

Adding to 25520045 its reverse (54002552), we get a palindrome (79522597).

The spelling of 25520045 in words is "twenty-five million, five hundred twenty thousand, forty-five".