25516505 has 12 divisors (see below), whose sum is σ = 35619300. Its totient is φ = 17496864.

The previous prime is 25516489. The next prime is 25516511. The reversal of 25516505 is 50561552.

It can be written as a sum of positive squares in 2 ways, for example, as 16540489 + 8976016 = 4067^2 + 2996^2 .

It is not a de Polignac number, because 25516505 - 2⁴ = 25516489 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51830 + ... + 52319.

It is an arithmetic number, because the mean of its divisors is an integer number (2968275).

Almost surely, 2^25516505 is an apocalyptic number.

It is an amenable number.

25516505 is a deficient number, since it is larger than the sum of its proper divisors (10102795).

25516505 is a wasteful number, since it uses less digits than its factorization.

25516505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104168 (or 104161 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 29.

The square root of 25516505 is about 5051.3864433440. The cubic root of 25516505 is about 294.4017561098.

The spelling of 25516505 in words is "twenty-five million, five hundred sixteen thousand, five hundred five".