25243105440 has 192 divisors, whose sum is σ = 91421374464. Its totient is φ = 5735175168.

The previous prime is 25243105421. The next prime is 25243105457. The reversal of 25243105440 is 4450134252.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 25243105398 and 25243105407.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 538627 + ... + 583613.

It is an arithmetic number, because the mean of its divisors is an integer number (476152992).

Almost surely, 2^25243105440 is an apocalyptic number.

25243105440 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 25243105440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45710687232).

25243105440 is an abundant number, since it is smaller than the sum of its proper divisors (66178269024).

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

25243105440 is a wasteful number, since it uses less digits than its factorization.

25243105440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45179 (or 45171 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 25243105440 its reverse (4450134252), we get a palindrome (29693239692).

The spelling of 25243105440 in words is "twenty-five billion, two hundred forty-three million, one hundred five thousand, four hundred forty".