25005555 has 24 divisors (see below), whose sum is σ = 45893952. Its totient is φ = 12551424.

The previous prime is 25005553. The next prime is 25005583. The reversal of 25005555 is 55550052.

It is a happy number.

It is not a de Polignac number, because 25005555 - 2¹ = 25005553 is a prime.

25005555 is a modest number, since divided by 5555 gives 2500 as remainder.

It is not an unprimeable number, because it can be changed into a prime (25005553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15579 + ... + 17108.

It is an arithmetic number, because the mean of its divisors is an integer number (1912248).

Almost surely, 2^25005555 is an apocalyptic number.

25005555 is a deficient number, since it is larger than the sum of its proper divisors (20888397).

25005555 is a wasteful number, since it uses less digits than its factorization.

25005555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32715 (or 32712 counting only the distinct ones).

The product of its (nonzero) digits is 6250, while the sum is 27.

The square root of 25005555 is about 5000.5554691454. Note that the first 3 decimals coincide. The cubic root of 25005555 is about 292.4234294421.

The spelling of 25005555 in words is "twenty-five million, five thousand, five hundred fifty-five".