25384745990881 has 4 divisors (see below), whose sum is σ = 25450002407700. Its totient is φ = 25319489574064.

The previous prime is 25384745990819. The next prime is 25384745990887. The reversal of 25384745990881 is 18809954748352.

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 4751266467600 + 20633479523281 = 2179740^2 + 4542409^2 .

It is a cyclic number.

It is not a de Polignac number, because 25384745990881 - 2⁷ = 25384745990753 is a prime.

It is a super-2 number, since 2×25384745990881² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25384745990887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32628207826 + ... + 32628208603.

It is an arithmetic number, because the mean of its divisors is an integer number (6362500601925).

Almost surely, 2^{25384745990881} is an apocalyptic number.

It is an amenable number.

25384745990881 is a deficient number, since it is larger than the sum of its proper divisors (65256416819).

25384745990881 is an equidigital number, since it uses as much as digits as its factorization.

25384745990881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65256416818.

The product of its (nonzero) digits is 696729600, while the sum is 73.

The spelling of 25384745990881 in words is "twenty-five trillion, three hundred eighty-four billion, seven hundred forty-five million, nine hundred ninety thousand, eight hundred eighty-one".