25564454648 has 8 divisors (see below), whose sum is σ = 47933352480. Its totient is φ = 12782227320.

The previous prime is 25564454639. The next prime is 25564454677. The reversal of 25564454648 is 84645446552.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 25564454648.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1597778408 + ... + 1597778423.

It is an arithmetic number, because the mean of its divisors is an integer number (5991669060).

Almost surely, 2^25564454648 is an apocalyptic number.

It is an amenable number.

25564454648 is a deficient number, since it is larger than the sum of its proper divisors (22368897832).

25564454648 is a wasteful number, since it uses less digits than its factorization.

25564454648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3195556837 (or 3195556833 counting only the distinct ones).

The product of its digits is 18432000, while the sum is 53.

The spelling of 25564454648 in words is "twenty-five billion, five hundred sixty-four million, four hundred fifty-four thousand, six hundred forty-eight".