25131335320 has 128 divisors (see below), whose sum is σ = 70063056000. Its totient is φ = 7900102656.

The previous prime is 25131335279. The next prime is 25131335357. The reversal of 25131335320 is 2353313152.

It is a Harshad number since it is a multiple of its sum of digits (28).

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, 519192 + ... + 565528.

It is an arithmetic number, because the mean of its divisors is an integer number (547367625).

Almost surely, 2^25131335320 is an apocalyptic number.

25131335320 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 25131335320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35031528000).

25131335320 is an abundant number, since it is smaller than the sum of its proper divisors (44931720680).

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

25131335320 is a wasteful number, since it uses less digits than its factorization.

25131335320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46517 (or 46513 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 28.

Adding to 25131335320 its reverse (2353313152), we get a palindrome (27484648472).

The spelling of 25131335320 in words is "twenty-five billion, one hundred thirty-one million, three hundred thirty-five thousand, three hundred twenty".