25808082505 has 8 divisors (see below), whose sum is σ = 30974444424. Its totient is φ = 20643302400.

The previous prime is 25808082497. The next prime is 25808082523. The reversal of 25808082505 is 50528080852.

It can be written as a sum of positive squares in 4 ways, for example, as 136352329 + 25671730176 = 11677^2 + 160224^2 .

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

It is not a de Polignac number, because 25808082505 - 2³ = 25808082497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359256 + ... + 425065.

It is an arithmetic number, because the mean of its divisors is an integer number (3871805553).

Almost surely, 2^25808082505 is an apocalyptic number.

It is an amenable number.

25808082505 is a deficient number, since it is larger than the sum of its proper divisors (5166361919).

25808082505 is an equidigital number, since it uses as much as digits as its factorization.

25808082505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790907.

The product of its (nonzero) digits is 256000, while the sum is 43.

The spelling of 25808082505 in words is "twenty-five billion, eight hundred eight million, eighty-two thousand, five hundred five".