25773480644 has 6 divisors (see below), whose sum is σ = 45103591134. Its totient is φ = 12886740320.

The previous prime is 25773480643. The next prime is 25773480709. The reversal of 25773480644 is 44608437752.

It can be written as a sum of positive squares in only one way, i.e., 24878752900 + 894727744 = 157730^2 + 29912^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25773480592 and 25773480601.

It is not an unprimeable number, because it can be changed into a prime (25773480643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3221685077 + ... + 3221685084.

It is an arithmetic number, because the mean of its divisors is an integer number (7517265189).

Almost surely, 2^25773480644 is an apocalyptic number.

It is an amenable number.

25773480644 is a deficient number, since it is larger than the sum of its proper divisors (19330110490).

25773480644 is a wasteful number, since it uses less digits than its factorization.

25773480644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6443370165 (or 6443370163 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 50.

The spelling of 25773480644 in words is "twenty-five billion, seven hundred seventy-three million, four hundred eighty thousand, six hundred forty-four".