18855255881 has 24 divisors (see below), whose sum is σ = 23866890432. Its totient is φ = 14580165600.

The previous prime is 18855255877. The next prime is 18855255893.

It is a happy number.

18855255881 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18855255881 - 2² = 18855255877 is a prime.

It is a super-2 number, since 2×18855255881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18855255821) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 25991 + ... + 195923.

It is an arithmetic number, because the mean of its divisors is an integer number (994453768).

Almost surely, 2^18855255881 is an apocalyptic number.

18855255881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18855255881 is a deficient number, since it is larger than the sum of its proper divisors (5011634551).

18855255881 is a wasteful number, since it uses less digits than its factorization.

18855255881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170093 (or 170082 counting only the distinct ones).

The product of its digits is 5120000, while the sum is 56.

The spelling of 18855255881 in words is "eighteen billion, eight hundred fifty-five million, two hundred fifty-five thousand, eight hundred eighty-one".