25081215840 has 384 divisors, whose sum is σ = 89541244800. Its totient is φ = 6637842432.

The previous prime is 25081215839. The next prime is 25081215869. The reversal of 25081215840 is 4851218052.

25081215840 is a `hidden beast` number, since 2 + 50 + 8 + 1 + 21 + 584 + 0 = 666.

It is a super-3 number, since 3×25081215840³ (a number of 32 digits) contains 333 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 25081215795 and 25081215804.

It is a congruent number.

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, 80131524 + ... + 80131836.

It is an arithmetic number, because the mean of its divisors is an integer number (233180325).

Almost surely, 2^25081215840 is an apocalyptic number.

25081215840 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 25081215840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44770622400).

25081215840 is an abundant number, since it is smaller than the sum of its proper divisors (64460028960).

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

25081215840 is an equidigital number, since it uses as much as digits as its factorization.

25081215840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578 (or 552 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 36.

The spelling of 25081215840 in words is "twenty-five billion, eighty-one million, two hundred fifteen thousand, eight hundred forty".