25555257 has 40 divisors (see below), whose sum is σ = 46998336. Its totient is φ = 13475808.

The previous prime is 25555249. The next prime is 25555261. The reversal of 25555257 is 75255552.

25555257 is a `hidden beast` number, since 2 + 55 + 552 + 57 = 666.

It is not a de Polignac number, because 25555257 - 2³ = 25555249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25555237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5638 + ... + 9104.

Almost surely, 2^25555257 is an apocalyptic number.

25555257 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

25555257 is a deficient number, since it is larger than the sum of its proper divisors (21443079).

25555257 is a wasteful number, since it uses less digits than its factorization.

25555257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3499 (or 3490 counting only the distinct ones).

The product of its digits is 87500, while the sum is 36.

The square root of 25555257 is about 5055.2207666926. The cubic root of 25555257 is about 294.5507170309.

The spelling of 25555257 in words is "twenty-five million, five hundred fifty-five thousand, two hundred fifty-seven".