25442555 has 4 divisors (see below), whose sum is σ = 30531072. Its totient is φ = 20354040.

The previous prime is 25442497. The next prime is 25442563. The reversal of 25442555 is 55524452.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 25442555 - 2¹⁰ = 25441531 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2544251 + ... + 2544260.

It is an arithmetic number, because the mean of its divisors is an integer number (7632768).

Almost surely, 2^25442555 is an apocalyptic number.

25442555 is a deficient number, since it is larger than the sum of its proper divisors (5088517).

25442555 is an equidigital number, since it uses as much as digits as its factorization.

25442555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5088516.

The product of its digits is 40000, while the sum is 32.

The square root of 25442555 is about 5044.0613596585. The cubic root of 25442555 is about 294.1170766381.

The spelling of 25442555 in words is "twenty-five million, four hundred forty-two thousand, five hundred fifty-five".