18500386855 has 4 divisors (see below), whose sum is σ = 22200464232. Its totient is φ = 14800309480.

The previous prime is 18500386829. The next prime is 18500386871. The reversal of 18500386855 is 55868300581.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55868300581 = 23 ⋅2429056547.

It is not a de Polignac number, because 18500386855 - 2¹¹ = 18500384807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18500386799 and 18500386808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1850038681 + ... + 1850038690.

It is an arithmetic number, because the mean of its divisors is an integer number (5550116058).

Almost surely, 2^18500386855 is an apocalyptic number.

18500386855 is a deficient number, since it is larger than the sum of its proper divisors (3700077377).

18500386855 is an equidigital number, since it uses as much as digits as its factorization.

18500386855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3700077376.

The product of its (nonzero) digits is 1152000, while the sum is 49.

The spelling of 18500386855 in words is "eighteen billion, five hundred million, three hundred eighty-six thousand, eight hundred fifty-five".