25195855920 has 320 divisors, whose sum is σ = 83743925760. Its totient is φ = 6248448000.

The previous prime is 25195855897. The next prime is 25195855967. The reversal of 25195855920 is 2955859152.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 104547000 + ... + 104547240.

It is an arithmetic number, because the mean of its divisors is an integer number (261699768).

Almost surely, 2^25195855920 is an apocalyptic number.

25195855920 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 25195855920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41871962880).

25195855920 is an abundant number, since it is smaller than the sum of its proper divisors (58548069840).

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

25195855920 is a wasteful number, since it uses less digits than its factorization.

25195855920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604 (or 598 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 51.

The spelling of 25195855920 in words is "twenty-five billion, one hundred ninety-five million, eight hundred fifty-five thousand, nine hundred twenty".