18520355555 has 8 divisors (see below), whose sum is σ = 23933998032. Its totient is φ = 13676570208.

The previous prime is 18520355501. The next prime is 18520355617. The reversal of 18520355555 is 55555302581.

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 18520355555 - 2¹⁴ = 18520339171 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 (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142464209 + ... + 142464338.

It is an arithmetic number, because the mean of its divisors is an integer number (2991749754).

Almost surely, 2^18520355555 is an apocalyptic number.

18520355555 is a deficient number, since it is larger than the sum of its proper divisors (5413642477).

18520355555 is a wasteful number, since it uses less digits than its factorization.

18520355555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284928565.

The product of its (nonzero) digits is 750000, while the sum is 44.

The spelling of 18520355555 in words is "eighteen billion, five hundred twenty million, three hundred fifty-five thousand, five hundred fifty-five".