25331331220 has 96 divisors (see below), whose sum is σ = 59629691520. Its totient is φ = 8974748160.

The previous prime is 25331331217. The next prime is 25331331229. The reversal of 25331331220 is 2213313352.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25331331229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1218715 + ... + 1239325.

It is an arithmetic number, because the mean of its divisors is an integer number (621142620).

Almost surely, 2^25331331220 is an apocalyptic number.

25331331220 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 25331331220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29814845760).

25331331220 is an abundant number, since it is smaller than the sum of its proper divisors (34298360300).

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

25331331220 is a wasteful number, since it uses less digits than its factorization.

25331331220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20825 (or 20823 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 25.

Adding to 25331331220 its reverse (2213313352), we get a palindrome (27544644572).

The spelling of 25331331220 in words is "twenty-five billion, three hundred thirty-one million, three hundred thirty-one thousand, two hundred twenty".