25557225 has 24 divisors (see below), whose sum is σ = 42556800. Its totient is φ = 13533120.

The previous prime is 25557157. The next prime is 25557229. The reversal of 25557225 is 52275552.

It is not a de Polignac number, because 25557225 - 2⁸ = 25556969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25557229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10032 + ... + 12318.

It is an arithmetic number, because the mean of its divisors is an integer number (1773200).

Almost surely, 2^25557225 is an apocalyptic number.

25557225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25557225 is a deficient number, since it is larger than the sum of its proper divisors (16999575).

25557225 is a wasteful number, since it uses less digits than its factorization.

25557225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2449 (or 2444 counting only the distinct ones).

The product of its digits is 35000, while the sum is 33.

The square root of 25557225 is about 5055.4154131980. The cubic root of 25557225 is about 294.5582779140.

The spelling of 25557225 in words is "twenty-five million, five hundred fifty-seven thousand, two hundred twenty-five".