25445025985 has 16 divisors (see below), whose sum is σ = 31398803856. Its totient is φ = 19780892928.

The previous prime is 25445025919. The next prime is 25445025989. The reversal of 25445025985 is 58952054452.

It can be written as a sum of positive squares in 8 ways, for example, as 29333056 + 25415692929 = 5416^2 + 159423^2 .

It is a cyclic number.

It is not a de Polignac number, because 25445025985 - 2⁷ = 25445025857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25445025989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61159 + ... + 233731.

It is an arithmetic number, because the mean of its divisors is an integer number (1962425241).

Almost surely, 2^25445025985 is an apocalyptic number.

It is an amenable number.

25445025985 is a deficient number, since it is larger than the sum of its proper divisors (5953777871).

25445025985 is a wasteful number, since it uses less digits than its factorization.

25445025985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173412.

The product of its (nonzero) digits is 2880000, while the sum is 49.

The spelling of 25445025985 in words is "twenty-five billion, four hundred forty-five million, twenty-five thousand, nine hundred eighty-five".