25944332644 has 6 divisors (see below), whose sum is σ = 45402582134. Its totient is φ = 12972166320.

The previous prime is 25944332599. The next prime is 25944332651. The reversal of 25944332644 is 44623344952.

It can be written as a sum of positive squares in only one way, i.e., 24435942400 + 1508390244 = 156320^2 + 38838^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25944332594 and 25944332603.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3243041577 + ... + 3243041584.

Almost surely, 2^25944332644 is an apocalyptic number.

It is an amenable number.

25944332644 is a deficient number, since it is larger than the sum of its proper divisors (19458249490).

25944332644 is a wasteful number, since it uses less digits than its factorization.

25944332644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6486083165 (or 6486083163 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 46.

The spelling of 25944332644 in words is "twenty-five billion, nine hundred forty-four million, three hundred thirty-two thousand, six hundred forty-four".