25305587500 has 72 divisors (see below), whose sum is σ = 55468606032. Its totient is φ = 10101000000.

The previous prime is 25305587443. The next prime is 25305587501. The reversal of 25305587500 is 578550352.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (25305587501) 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, 6835650 + ... + 6839350.

It is an arithmetic number, because the mean of its divisors is an integer number (770397306).

Almost surely, 2^25305587500 is an apocalyptic number.

25305587500 is a gapful number since it is divisible by the number (20) 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 25305587500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27734303016).

25305587500 is an abundant number, since it is smaller than the sum of its proper divisors (30163018532).

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

25305587500 is an equidigital number, since it uses as much as digits as its factorization.

25305587500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4277 (or 4255 counting only the distinct ones).

The product of its (nonzero) digits is 210000, while the sum is 40.

The spelling of 25305587500 in words is "twenty-five billion, three hundred five million, five hundred eighty-seven thousand, five hundred".