5518445648 has 30 divisors (see below), whose sum is σ = 10897996122. Its totient is φ = 2706100800.

The previous prime is 5518445587. The next prime is 5518445657. The reversal of 5518445648 is 8465448155.

It can be written as a sum of positive squares in only one way, i.e., 5101959184 + 416486464 = 71428^2 + 20408^2 .

It is a junction number, because it is equal to n+sod(n) for n = 5518445596 and 5518445605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2161973 + ... + 2164523.

Almost surely, 2^5518445648 is an apocalyptic number.

It is an amenable number.

5518445648 is a deficient number, since it is larger than the sum of its proper divisors (5379550474).

5518445648 is an frugal number, since it uses more digits than its factorization.

5518445648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5163 (or 2606 counting only the distinct ones).

The product of its digits is 3072000, while the sum is 50.

The square root of 5518445648 is about 74286.2413102184. The cubic root of 5518445648 is about 1767.1452858361.

The spelling of 5518445648 in words is "five billion, five hundred eighteen million, four hundred forty-five thousand, six hundred forty-eight".