25555555 has 8 divisors (see below), whose sum is σ = 31186800. Its totient is φ = 20097696.

The previous prime is 25555531. The next prime is 25555561. The reversal of 25555555 is 55555552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25555555 - 2⁷ = 25555427 is a prime.

25555555 is a modest number, since divided by 5555 gives 2555 as remainder.

It is a plaindrome in base 10.

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 7 ways as a sum of consecutive naturals, for example, 43020 + ... + 43609.

It is an arithmetic number, because the mean of its divisors is an integer number (3898350).

Almost surely, 2^25555555 is an apocalyptic number.

25555555 is a deficient number, since it is larger than the sum of its proper divisors (5631245).

25555555 is an equidigital number, since it uses as much as digits as its factorization.

25555555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86693.

The product of its digits is 156250, while the sum is 37.

The square root of 25555555 is about 5055.2502410860. The cubic root of 25555555 is about 294.5518619457.

The spelling of 25555555 in words is "twenty-five million, five hundred fifty-five thousand, five hundred fifty-five".