25990019880 has 128 divisors (see below), whose sum is σ = 85097589120. Its totient is φ = 6297697280.

The previous prime is 25990019833. The next prime is 25990019893. The reversal of 25990019880 is 8891009952.

It is a super-2 number, since 2×25990019880² (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 (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4660774 + ... + 4666346.

It is an arithmetic number, because the mean of its divisors is an integer number (664824915).

Almost surely, 2^25990019880 is an apocalyptic number.

25990019880 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 25990019880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42548794560).

25990019880 is an abundant number, since it is smaller than the sum of its proper divisors (59107569240).

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

25990019880 is a wasteful number, since it uses less digits than its factorization.

25990019880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9131 (or 9127 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 51.

The spelling of 25990019880 in words is "twenty-five billion, nine hundred ninety million, nineteen thousand, eight hundred eighty".