18481851855 has 24 divisors (see below), whose sum is σ = 33721275120. Its totient is φ = 9338198400.

The previous prime is 18481851827. The next prime is 18481851859. The reversal of 18481851855 is 55815818481.

18481851855 is a `hidden beast` number, since 1 + 8 + 481 + 85 + 1 + 85 + 5 = 666.

It is not a de Polignac number, because 18481851855 - 2⁵ = 18481851823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18481851859) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10807246 + ... + 10808955.

It is an arithmetic number, because the mean of its divisors is an integer number (1405053130).

Almost surely, 2^18481851855 is an apocalyptic number.

18481851855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18481851855 is a deficient number, since it is larger than the sum of its proper divisors (15239423265).

18481851855 is a wasteful number, since it uses less digits than its factorization.

18481851855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21616231 (or 21616228 counting only the distinct ones).

The product of its digits is 2048000, while the sum is 54.

The spelling of 18481851855 in words is "eighteen billion, four hundred eighty-one million, eight hundred fifty-one thousand, eight hundred fifty-five".