25396811440 has 320 divisors, whose sum is σ = 80256863232. Its totient is φ = 7217049600.

The previous prime is 25396811387. The next prime is 25396811441. The reversal of 25396811440 is 4411869352.

It is not an unprimeable number, because it can be changed into a prime (25396811441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6644730 + ... + 6648550.

Almost surely, 2^25396811440 is an apocalyptic number.

25396811440 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 25396811440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40128431616).

25396811440 is an abundant number, since it is smaller than the sum of its proper divisors (54860051792).

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

25396811440 is a wasteful number, since it uses less digits than its factorization.

25396811440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3948 (or 3942 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 25396811440 in words is "twenty-five billion, three hundred ninety-six million, eight hundred eleven thousand, four hundred forty".