25530243240 has 64 divisors (see below), whose sum is σ = 76607818560. Its totient is φ = 6806545920.

The previous prime is 25530243191. The next prime is 25530243257. The reversal of 25530243240 is 4234203552.

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 = 25530243198 and 25530243207.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 580092 + ... + 622548.

It is an arithmetic number, because the mean of its divisors is an integer number (1196997165).

Almost surely, 2^25530243240 is an apocalyptic number.

25530243240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25530243240 is an abundant number, since it is smaller than the sum of its proper divisors (51077575320).

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

25530243240 is a wasteful number, since it uses less digits than its factorization.

25530243240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47482 (or 47478 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 30.

Adding to 25530243240 its reverse (4234203552), we get a palindrome (29764446792).

The spelling of 25530243240 in words is "twenty-five billion, five hundred thirty million, two hundred forty-three thousand, two hundred forty".