25195027509 has 8 divisors (see below), whose sum is σ = 37325966720. Its totient is φ = 16796684988.

The previous prime is 25195027489. The next prime is 25195027511. The reversal of 25195027509 is 90572059152.

25195027509 is a `hidden beast` number, since 2 + 51 + 95 + 0 + 2 + 7 + 509 = 666.

It is not a de Polignac number, because 25195027509 - 2⁵ = 25195027477 is a prime.

It is a super-2 number, since 2×25195027509² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25195027409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 466574557 + ... + 466574610.

It is an arithmetic number, because the mean of its divisors is an integer number (4665745840).

Almost surely, 2^25195027509 is an apocalyptic number.

It is an amenable number.

25195027509 is a deficient number, since it is larger than the sum of its proper divisors (12130939211).

25195027509 is an equidigital number, since it uses as much as digits as its factorization.

25195027509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933149176 (or 933149170 counting only the distinct ones).

The product of its (nonzero) digits is 283500, while the sum is 45.

The spelling of 25195027509 in words is "twenty-five billion, one hundred ninety-five million, twenty-seven thousand, five hundred nine".