18383838381 has 8 divisors (see below), whose sum is σ = 27235316160. Its totient is φ = 12255892236.

The previous prime is 18383838353. The next prime is 18383838409.

18383838381 is a `hidden beast` number, since 183 + 8 + 3 + 8 + 383 + 81 = 666.

18383838381 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (18383838353) and next prime (18383838409).

It is not a de Polignac number, because 18383838381 - 2¹⁴ = 18383821997 is a prime.

It is a super-2 number, since 2×18383838381² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18383838331) 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 7 ways as a sum of consecutive naturals, for example, 340441425 + ... + 340441478.

It is an arithmetic number, because the mean of its divisors is an integer number (3404414520).

Almost surely, 2^18383838381 is an apocalyptic number.

It is an amenable number.

18383838381 is a deficient number, since it is larger than the sum of its proper divisors (8851477779).

18383838381 is an equidigital number, since it uses as much as digits as its factorization.

18383838381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680882912 (or 680882906 counting only the distinct ones).

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

The spelling of 18383838381 in words is "eighteen billion, three hundred eighty-three million, eight hundred thirty-eight thousand, three hundred eighty-one".