25616625 has 16 divisors (see below), whose sum is σ = 42626688. Its totient is φ = 13662000.

The previous prime is 25616621. The next prime is 25616639. The reversal of 25616625 is 52661652.

It is a happy number.

It is not a de Polignac number, because 25616625 - 2² = 25616621 is a prime.

It is a super-2 number, since 2×25616625² = 1312422952781250, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25616621) 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, 33781 + ... + 34530.

It is an arithmetic number, because the mean of its divisors is an integer number (2664168).

Almost surely, 2^25616625 is an apocalyptic number.

25616625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25616625 is a deficient number, since it is larger than the sum of its proper divisors (17010063).

25616625 is an equidigital number, since it uses as much as digits as its factorization.

25616625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68329 (or 68319 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 25616625 is about 5061.2868916907. The cubic root of 25616625 is about 294.7863050685.

The spelling of 25616625 in words is "twenty-five million, six hundred sixteen thousand, six hundred twenty-five".