25561045 has 8 divisors (see below), whose sum is σ = 30955320. Its totient is φ = 20260800.

The previous prime is 25561033. The next prime is 25561051. The reversal of 25561045 is 54016552.

It can be written as a sum of positive squares in 4 ways, for example, as 10491121 + 15069924 = 3239^2 + 3882^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25561045 - 2¹⁹ = 25036757 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22906 + ... + 23995.

It is an arithmetic number, because the mean of its divisors is an integer number (3869415).

Almost surely, 2^25561045 is an apocalyptic number.

It is an amenable number.

25561045 is a deficient number, since it is larger than the sum of its proper divisors (5394275).

25561045 is a wasteful number, since it uses less digits than its factorization.

25561045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47015.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 25561045 is about 5055.7932117522. The cubic root of 25561045 is about 294.5729529106.

Adding to 25561045 its reverse (54016552), we get a palindrome (79577597).

The spelling of 25561045 in words is "twenty-five million, five hundred sixty-one thousand, forty-five".