25231805440 has 176 divisors, whose sum is σ = 64109092320. Its totient is φ = 9502064640.

The previous prime is 25231805407. The next prime is 25231805477. The reversal of 25231805440 is 4450813252.

It is a junction number, because it is equal to n+sod(n) for n = 25231805396 and 25231805405.

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 15 ways as a sum of consecutive naturals, for example, 17606964 + ... + 17608396.

Almost surely, 2^25231805440 is an apocalyptic number.

25231805440 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 25231805440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32054546160).

25231805440 is an abundant number, since it is smaller than the sum of its proper divisors (38877286880).

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

25231805440 is a wasteful number, since it uses less digits than its factorization.

25231805440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658 (or 1640 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 34.

The spelling of 25231805440 in words is "twenty-five billion, two hundred thirty-one million, eight hundred five thousand, four hundred forty".