25555280503 has 4 divisors (see below), whose sum is σ = 25559324640. Its totient is φ = 25551236368.

The previous prime is 25555280489. The next prime is 25555280533. The reversal of 25555280503 is 30508255552.

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

It is a cyclic number.

It is not a de Polignac number, because 25555280503 - 2³³ = 16965345911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25555280533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2012575 + ... + 2025232.

It is an arithmetic number, because the mean of its divisors is an integer number (6389831160).

Almost surely, 2^25555280503 is an apocalyptic number.

25555280503 is a deficient number, since it is larger than the sum of its proper divisors (4044137).

25555280503 is an equidigital number, since it uses as much as digits as its factorization.

25555280503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4044136.

The product of its (nonzero) digits is 300000, while the sum is 40.

The spelling of 25555280503 in words is "twenty-five billion, five hundred fifty-five million, two hundred eighty thousand, five hundred three".