25525557 has 8 divisors (see below), whose sum is σ = 37815680. Its totient is φ = 17017020.

The previous prime is 25525553. The next prime is 25525589. The reversal of 25525557 is 75552552.

25525557 is a `hidden beast` number, since 2 + 552 + 55 + 57 = 666.

It is not a de Polignac number, because 25525557 - 2² = 25525553 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25525553) 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, 472669 + ... + 472722.

It is an arithmetic number, because the mean of its divisors is an integer number (4726960).

Almost surely, 2^25525557 is an apocalyptic number.

25525557 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

25525557 is a deficient number, since it is larger than the sum of its proper divisors (12290123).

25525557 is an equidigital number, since it uses as much as digits as its factorization.

25525557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945400 (or 945394 counting only the distinct ones).

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

The square root of 25525557 is about 5052.2823555300. The cubic root of 25525557 is about 294.4365650780.

The spelling of 25525557 in words is "twenty-five million, five hundred twenty-five thousand, five hundred fifty-seven".