25321545240 has 128 divisors (see below), whose sum is σ = 78850437120. Its totient is φ = 6498316800.

The previous prime is 25321545217. The next prime is 25321545241. The reversal of 25321545240 is 4254512352.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25321545241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 654517 + ... + 692123.

It is an arithmetic number, because the mean of its divisors is an integer number (616019040).

Almost surely, 2^25321545240 is an apocalyptic number.

25321545240 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 25321545240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39425218560).

25321545240 is an abundant number, since it is smaller than the sum of its proper divisors (53528891880).

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

25321545240 is a wasteful number, since it uses less digits than its factorization.

25321545240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37833 (or 37829 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 33.

The spelling of 25321545240 in words is "twenty-five billion, three hundred twenty-one million, five hundred forty-five thousand, two hundred forty".