25565256552 has 144 divisors (see below), whose sum is σ = 71036300160. Its totient is φ = 7661456000.

The previous prime is 25565256529. The next prime is 25565256589.

25565256552 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 29623273 + ... + 29624135.

It is an arithmetic number, because the mean of its divisors is an integer number (493307640).

Almost surely, 2^25565256552 is an apocalyptic number.

25565256552 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25565256552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35518150080).

25565256552 is an abundant number, since it is smaller than the sum of its proper divisors (45471043608).

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

25565256552 is a wasteful number, since it uses less digits than its factorization.

25565256552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096 (or 980 counting only the distinct ones).

The product of its digits is 4500000, while the sum is 48.

The spelling of 25565256552 in words is "twenty-five billion, five hundred sixty-five million, two hundred fifty-six thousand, five hundred fifty-two".