25561003 has 8 divisors (see below), whose sum is σ = 27876800. Its totient is φ = 23295168.

The previous prime is 25560989. The next prime is 25561007. The reversal of 25561003 is 30016552.

It is a happy number.

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

It is not a de Polignac number, because 25561003 - 2⁵ = 25560971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25561007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11418 + ... + 13471.

It is an arithmetic number, because the mean of its divisors is an integer number (3484600).

Almost surely, 2^25561003 is an apocalyptic number.

25561003 is a deficient number, since it is larger than the sum of its proper divisors (2315797).

25561003 is a wasteful number, since it uses less digits than its factorization.

25561003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24981.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 25561003 is about 5055.7890580996. The cubic root of 25561003 is about 294.5727915704.

Adding to 25561003 its reverse (30016552), we get a palindrome (55577555).

The spelling of 25561003 in words is "twenty-five million, five hundred sixty-one thousand, three".