25819205220 has 240 divisors, whose sum is σ = 84862407168. Its totient is φ = 6558900480.

The previous prime is 25819205213. The next prime is 25819205221. The reversal of 25819205220 is 2250291852.

25819205220 is a `hidden beast` number, since 2 + 581 + 9 + 2 + 0 + 52 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (25819205221) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 10096182 + ... + 10098738.

Almost surely, 2^25819205220 is an apocalyptic number.

25819205220 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 25819205220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42431203584).

25819205220 is an abundant number, since it is smaller than the sum of its proper divisors (59043201948).

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

25819205220 is a wasteful number, since it uses less digits than its factorization.

25819205220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2872 (or 2861 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The spelling of 25819205220 in words is "twenty-five billion, eight hundred nineteen million, two hundred five thousand, two hundred twenty".