25317565530 has 96 divisors (see below), whose sum is σ = 62403469632. Its totient is φ = 6572805120.

The previous prime is 25317565513. The next prime is 25317565543. The reversal of 25317565530 is 3556571352.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12551082 + ... + 12553098.

It is an arithmetic number, because the mean of its divisors is an integer number (650036142).

Almost surely, 2^25317565530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25317565530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31201734816).

25317565530 is an abundant number, since it is smaller than the sum of its proper divisors (37085904102).

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

25317565530 is a wasteful number, since it uses less digits than its factorization.

25317565530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2252 (or 2181 counting only the distinct ones).

The product of its (nonzero) digits is 472500, while the sum is 42.

The spelling of 25317565530 in words is "twenty-five billion, three hundred seventeen million, five hundred sixty-five thousand, five hundred thirty".