25309144242 has 12 divisors (see below), whose sum is σ = 54836479230. Its totient is φ = 8436381408.

The previous prime is 25309144181. The next prime is 25309144283. The reversal of 25309144242 is 24244190352.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 25274322441 + 34821801 = 158979^2 + 5901^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25309144197 and 25309144206.

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 5 ways as a sum of consecutive naturals, for example, 703031767 + ... + 703031802.

Almost surely, 2^25309144242 is an apocalyptic number.

25309144242 is an abundant number, since it is smaller than the sum of its proper divisors (29527334988).

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

25309144242 is a wasteful number, since it uses less digits than its factorization.

25309144242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406063577 (or 1406063574 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 25309144242 in words is "twenty-five billion, three hundred nine million, one hundred forty-four thousand, two hundred forty-two".