25495557 has 4 divisors (see below), whose sum is σ = 33994080. Its totient is φ = 16997036.

The previous prime is 25495541. The next prime is 25495571. The reversal of 25495557 is 75559452.

25495557 is nontrivially palindromic in base 14.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25495557 - 2⁴ = 25495541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25495537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4249257 + ... + 4249262.

It is an arithmetic number, because the mean of its divisors is an integer number (8498520).

Almost surely, 2^25495557 is an apocalyptic number.

It is an amenable number.

25495557 is a deficient number, since it is larger than the sum of its proper divisors (8498523).

25495557 is an equidigital number, since it uses as much as digits as its factorization.

25495557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8498522.

The product of its digits is 315000, while the sum is 42.

The square root of 25495557 is about 5049.3125274635. The cubic root of 25495557 is about 294.3211701465.

The spelling of 25495557 in words is "twenty-five million, four hundred ninety-five thousand, five hundred fifty-seven".