25085555880 has 384 divisors, whose sum is σ = 98590556160. Its totient is φ = 5044032000.

The previous prime is 25085555863. The next prime is 25085555909. The reversal of 25085555880 is 8855558052.

It is a super-2 number, since 2×25085555880² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 1998825 + ... + 2011335.

It is an arithmetic number, because the mean of its divisors is an integer number (256746240).

Almost surely, 2^25085555880 is an apocalyptic number.

25085555880 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 25085555880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49295278080).

25085555880 is an abundant number, since it is smaller than the sum of its proper divisors (73505000280).

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

25085555880 is a wasteful number, since it uses less digits than its factorization.

25085555880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12581 (or 12570 counting only the distinct ones).

The product of its (nonzero) digits is 3200000, while the sum is 51.

The spelling of 25085555880 in words is "twenty-five billion, eighty-five million, five hundred fifty-five thousand, eight hundred eighty".