5518726544809 has 9 divisors (see below), whose sum is σ = 5769160035933. Its totient is φ = 5278730230092.

The previous prime is 5518726544759. The next prime is 5518726544839. The reversal of 5518726544809 is 9084456278155.

The square root of 5518726544809 is 2349197.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 5518726544809 - 2³⁹ = 4968970730921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5518726544839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 53980462 + ... + 54082600.

Almost surely, 2^{5518726544809} is an apocalyptic number.

5518726544809 is the 2349197-th square number.

5518726544809 is the 1174599-th centered octagonal number.

It is an amenable number.

5518726544809 is a deficient number, since it is larger than the sum of its proper divisors (250433491124).

5518726544809 is an frugal number, since it uses more digits than its factorization.

5518726544809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204324 (or 102162 counting only the distinct ones).

The product of its (nonzero) digits is 96768000, while the sum is 64.

Multiplying 5518726544809 by its sum of digits (64), we get a square (353198498867776 = 18793576²).

The spelling of 5518726544809 in words is "five trillion, five hundred eighteen billion, seven hundred twenty-six million, five hundred forty-four thousand, eight hundred nine".