25555555553 has 32 divisors (see below), whose sum is σ = 29913698304. Its totient is φ = 21597840000.

The previous prime is 25555555549. The next prime is 25555555573. The reversal of 25555555553 is 35555555552.

It is not a de Polignac number, because 25555555553 - 2² = 25555555549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25555555573) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2806538 + ... + 2815628.

It is an arithmetic number, because the mean of its divisors is an integer number (934803072).

Almost surely, 2^25555555553 is an apocalyptic number.

25555555553 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

25555555553 is a deficient number, since it is larger than the sum of its proper divisors (4358142751).

25555555553 is a wasteful number, since it uses less digits than its factorization.

25555555553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9437.

The product of its digits is 11718750, while the sum is 50.

Subtracting 25555555553 from its reverse (35555555552), we obtain a palindrome (9999999999).

It can be divided in two parts, 2 and 5555555553, that added together give a palindrome (5555555555).

The spelling of 25555555553 in words is "twenty-five billion, five hundred fifty-five million, five hundred fifty-five thousand, five hundred fifty-three".