25502775550 has 48 divisors (see below), whose sum is σ = 54224386560. Its totient is φ = 8741748960.

The previous prime is 25502775523. The next prime is 25502775553. The reversal of 25502775550 is 5557720552.

It is a junction number, because it is equal to n+sod(n) for n = 25502775497 and 25502775506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25502775553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2685711 + ... + 2695189.

It is an arithmetic number, because the mean of its divisors is an integer number (1129674720).

Almost surely, 2^25502775550 is an apocalyptic number.

25502775550 is an abundant number, since it is smaller than the sum of its proper divisors (28721611010).

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

25502775550 is a wasteful number, since it uses less digits than its factorization.

25502775550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17185 (or 17180 counting only the distinct ones).

The product of its (nonzero) digits is 612500, while the sum is 43.

The spelling of 25502775550 in words is "twenty-five billion, five hundred two million, seven hundred seventy-five thousand, five hundred fifty".