25005005 has 4 divisors (see below), whose sum is σ = 30006012. Its totient is φ = 20004000.

The previous prime is 25004983. The next prime is 25005017. The reversal of 25005005 is 50050052.

It is a happy number.

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 19307236 + 5697769 = 4394^2 + 2387^2 .

It is not a de Polignac number, because 25005005 - 2¹² = 25000909 is a prime.

It is a Duffinian number.

25005005 is a modest number, since divided by 5005 gives 25 as remainder.

It is a Curzon number.

It is a zygodrome in base 15.

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, 2500496 + ... + 2500505.

It is an arithmetic number, because the mean of its divisors is an integer number (7501503).

Almost surely, 2^25005005 is an apocalyptic number.

It is an amenable number.

25005005 is a deficient number, since it is larger than the sum of its proper divisors (5001007).

25005005 is an equidigital number, since it uses as much as digits as its factorization.

25005005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5001006.

The product of its (nonzero) digits is 250, while the sum is 17.

The square root of 25005005 is about 5000.5004749525. The cubic root of 25005005 is about 292.4212854643.

Adding to 25005005 its reverse (50050052), we get a palindrome (75055057).

It can be divided in two parts, 2500500 and 5, that multiplied together give a triangular number (12502500 = T₅₀₀₀).

The spelling of 25005005 in words is "twenty-five million, five thousand, five".