18550518505 has 8 divisors (see below), whose sum is σ = 22862260872. Its totient is φ = 14439322368.

The previous prime is 18550518449. The next prime is 18550518529. The reversal of 18550518505 is 50581505581.

It can be written as a sum of positive squares in 4 ways, for example, as 1573470889 + 16977047616 = 39667^2 + 130296^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18550518505 - 2²³ = 18542129897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50136352 + ... + 50136721.

It is an arithmetic number, because the mean of its divisors is an integer number (2857782609).

Almost surely, 2^18550518505 is an apocalyptic number.

It is an amenable number.

18550518505 is a deficient number, since it is larger than the sum of its proper divisors (4311742367).

18550518505 is a wasteful number, since it uses less digits than its factorization.

18550518505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100273115.

The product of its (nonzero) digits is 200000, while the sum is 43.

The spelling of 18550518505 in words is "eighteen billion, five hundred fifty million, five hundred eighteen thousand, five hundred five".