25015051440 has 120 divisors (see below), whose sum is σ = 84129087120. Its totient is φ = 6661135872.

The previous prime is 25015051381. The next prime is 25015051441. The reversal of 25015051440 is 4415051052.

25015051440 is a `hidden beast` number, since 25 + 0 + 150 + 51 + 440 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-3 number, since 3×25015051440³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (25015051441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 485979 + ... + 534981.

It is an arithmetic number, because the mean of its divisors is an integer number (701075726).

Almost surely, 2^25015051440 is an apocalyptic number.

25015051440 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 25015051440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42064543560).

25015051440 is an abundant number, since it is smaller than the sum of its proper divisors (59114035680).

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

25015051440 is a wasteful number, since it uses less digits than its factorization.

25015051440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49731 (or 49722 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The spelling of 25015051440 in words is "twenty-five billion, fifteen million, fifty-one thousand, four hundred forty".