18838333881 has 6 divisors (see below), whose sum is σ = 27210926730. Its totient is φ = 12558889248.

The previous prime is 18838333867. The next prime is 18838333903. The reversal of 18838333881 is 18833383881.

18838333881 is a `hidden beast` number, since 188 + 3 + 83 + 3 + 388 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13152419856 + 5685914025 = 114684^2 + 75405^2 .

It is not a de Polignac number, because 18838333881 - 2⁶ = 18838333817 is a prime.

It is a super-2 number, since 2×18838333881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18838333861) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1046574096 + ... + 1046574113.

It is an arithmetic number, because the mean of its divisors is an integer number (4535154455).

Almost surely, 2^18838333881 is an apocalyptic number.

It is an amenable number.

18838333881 is a deficient number, since it is larger than the sum of its proper divisors (8372592849).

18838333881 is a wasteful number, since it uses less digits than its factorization.

18838333881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2093148215 (or 2093148212 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 54.

The spelling of 18838333881 in words is "eighteen billion, eight hundred thirty-eight million, three hundred thirty-three thousand, eight hundred eighty-one".