25205555 has 4 divisors (see below), whose sum is σ = 30246672. Its totient is φ = 20164440.

The previous prime is 25205519. The next prime is 25205591. The reversal of 25205555 is 55550252.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (25205519) and next prime (25205591).

It is not a de Polignac number, because 25205555 - 2⁶ = 25205491 is a prime.

It is a Duffinian number.

25205555 is a modest number, since divided by 5555 gives 2520 as remainder.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2520551 + ... + 2520560.

It is an arithmetic number, because the mean of its divisors is an integer number (7561668).

Almost surely, 2^25205555 is an apocalyptic number.

25205555 is a deficient number, since it is larger than the sum of its proper divisors (5041117).

25205555 is an equidigital number, since it uses as much as digits as its factorization.

25205555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5041116.

The product of its (nonzero) digits is 12500, while the sum is 29.

The square root of 25205555 is about 5020.5134199602. The cubic root of 25205555 is about 293.2009826770.

The spelling of 25205555 in words is "twenty-five million, two hundred five thousand, five hundred fifty-five".