25507856225 has 6 divisors (see below), whose sum is σ = 31629741750. Its totient is φ = 20406284960.

The previous prime is 25507856189. The next prime is 25507856239. The reversal of 25507856225 is 52265870552.

It can be written as a sum of positive squares in 3 ways, for example, as 1683625024 + 23824231201 = 41032^2 + 154351^2 .

It is a de Polignac number, because none of the positive numbers 2^k-25507856225 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25507856225.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 510157100 + ... + 510157149.

It is an arithmetic number, because the mean of its divisors is an integer number (5271623625).

Almost surely, 2^25507856225 is an apocalyptic number.

25507856225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25507856225 is a deficient number, since it is larger than the sum of its proper divisors (6121885525).

25507856225 is a wasteful number, since it uses less digits than its factorization.

25507856225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020314259 (or 1020314254 counting only the distinct ones).

The product of its (nonzero) digits is 1680000, while the sum is 47.

The spelling of 25507856225 in words is "twenty-five billion, five hundred seven million, eight hundred fifty-six thousand, two hundred twenty-five".