25440440500 has 96 divisors (see below), whose sum is σ = 58907616768. Its totient is φ = 9564992000.

The previous prime is 25440440491. The next prime is 25440440521. The reversal of 25440440500 is 504404452.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8762049 + ... + 8764951.

It is an arithmetic number, because the mean of its divisors is an integer number (613621008).

Almost surely, 2^25440440500 is an apocalyptic number.

25440440500 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 25440440500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29453808384).

25440440500 is an abundant number, since it is smaller than the sum of its proper divisors (33467176268).

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

25440440500 is a wasteful number, since it uses less digits than its factorization.

25440440500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3970 (or 3958 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 28.

Adding to 25440440500 its reverse (504404452), we get a palindrome (25944844952).

The spelling of 25440440500 in words is "twenty-five billion, four hundred forty million, four hundred forty thousand, five hundred".