25556555242 has 32 divisors (see below), whose sum is σ = 39930194304. Its totient is φ = 12257784000.

The previous prime is 25556555239. The next prime is 25556555249. The reversal of 25556555242 is 24255565552.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 25556555192 and 25556555201.

It is not an unprimeable number, because it can be changed into a prime (25556555249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3810492 + ... + 3817192.

It is an arithmetic number, because the mean of its divisors is an integer number (1247818572).

Almost surely, 2^25556555242 is an apocalyptic number.

25556555242 is a deficient number, since it is larger than the sum of its proper divisors (14373639062).

25556555242 is a wasteful number, since it uses less digits than its factorization.

25556555242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7534.

The product of its digits is 3000000, while the sum is 46.

The spelling of 25556555242 in words is "twenty-five billion, five hundred fifty-six million, five hundred fifty-five thousand, two hundred forty-two".