25505502550 has 24 divisors (see below), whose sum is σ = 51752984472. Its totient is φ = 9274728000.

The previous prime is 25505502521. The next prime is 25505502551. The reversal of 25505502550 is 5520550552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25505502551) 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 11 ways as a sum of consecutive naturals, for example, 23186271 + ... + 23187370.

It is an arithmetic number, because the mean of its divisors is an integer number (2156374353).

Almost surely, 2^25505502550 is an apocalyptic number.

25505502550 is an abundant number, since it is smaller than the sum of its proper divisors (26247481922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25505502550 is a wasteful number, since it uses less digits than its factorization.

25505502550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46373664 (or 46373659 counting only the distinct ones).

The product of its (nonzero) digits is 62500, while the sum is 34.

The spelling of 25505502550 in words is "twenty-five billion, five hundred five million, five hundred two thousand, five hundred fifty".