25525505249 has 4 divisors (see below), whose sum is σ = 25529714436. Its totient is φ = 25521296064.

The previous prime is 25525505233. The next prime is 25525505311. The reversal of 25525505249 is 94250552552.

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 9258288400 + 16267216849 = 96220^2 + 127543^2 .

It is a cyclic number.

It is not a de Polignac number, because 25525505249 - 2⁴ = 25525505233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25525508249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2095484 + ... + 2107629.

It is an arithmetic number, because the mean of its divisors is an integer number (6382428609).

Almost surely, 2^25525505249 is an apocalyptic number.

It is an amenable number.

25525505249 is a deficient number, since it is larger than the sum of its proper divisors (4209187).

25525505249 is an equidigital number, since it uses as much as digits as its factorization.

25525505249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4209186.

The product of its (nonzero) digits is 900000, while the sum is 44.

The spelling of 25525505249 in words is "twenty-five billion, five hundred twenty-five million, five hundred five thousand, two hundred forty-nine".