25325443540 has 12 divisors (see below), whose sum is σ = 53183431476. Its totient is φ = 10130177408.

The previous prime is 25325443511. The next prime is 25325443567. The reversal of 25325443540 is 4534452352.

It can be written as a sum of positive squares in 2 ways, for example, as 18256333456 + 7069110084 = 135116^2 + 84078^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 25325443540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 633136069 + ... + 633136108.

It is an arithmetic number, because the mean of its divisors is an integer number (4431952623).

Almost surely, 2^25325443540 is an apocalyptic number.

25325443540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25325443540 is an abundant number, since it is smaller than the sum of its proper divisors (27857987936).

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

25325443540 is a wasteful number, since it uses less digits than its factorization.

25325443540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266272186 (or 1266272184 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 37.

Adding to 25325443540 its reverse (4534452352), we get a palindrome (29859895892).

The spelling of 25325443540 in words is "twenty-five billion, three hundred twenty-five million, four hundred forty-three thousand, five hundred forty".