25986084805 has 4 divisors (see below), whose sum is σ = 31183301772. Its totient is φ = 20788867840.

The previous prime is 25986084799. The next prime is 25986084823. The reversal of 25986084805 is 50848068952.

It is a happy number.

It is a Cunningham number, because it is equal to 161202²+1.

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 9355145284 + 16630939521 = 96722^2 + 128961^2 .

It is not a de Polignac number, because 25986084805 - 2¹⁷ = 25985953733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 2598608476 + ... + 2598608485.

It is an arithmetic number, because the mean of its divisors is an integer number (7795825443).

Almost surely, 2^25986084805 is an apocalyptic number.

It is an amenable number.

25986084805 is a deficient number, since it is larger than the sum of its proper divisors (5197216967).

25986084805 is an equidigital number, since it uses as much as digits as its factorization.

25986084805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5197216966.

The product of its (nonzero) digits is 5529600, while the sum is 55.

The spelling of 25986084805 in words is "twenty-five billion, nine hundred eighty-six million, eighty-four thousand, eight hundred five".