25489423845 has 20 divisors (see below), whose sum is σ = 45692153100. Its totient is φ = 13594359168.

The previous prime is 25489423831. The next prime is 25489423853. The reversal of 25489423845 is 54832498452.

25489423845 is a `hidden beast` number, since 2 + 548 + 94 + 2 + 3 + 8 + 4 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4276375236 + 21213048609 = 65394^2 + 145647^2 .

It is not a de Polignac number, because 25489423845 - 2⁴ = 25489423829 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25489423791 and 25489423800.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 31468020 + ... + 31468829.

It is an arithmetic number, because the mean of its divisors is an integer number (2284607655).

Almost surely, 2^25489423845 is an apocalyptic number.

It is an amenable number.

25489423845 is a deficient number, since it is larger than the sum of its proper divisors (20202729255).

25489423845 is an equidigital number, since it uses as much as digits as its factorization.

25489423845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62936866 (or 62936857 counting only the distinct ones).

The product of its digits is 11059200, while the sum is 54.

The spelling of 25489423845 in words is "twenty-five billion, four hundred eighty-nine million, four hundred twenty-three thousand, eight hundred forty-five".