18605838381 has 16 divisors (see below), whose sum is σ = 26952507456. Its totient is φ = 11348418816.

The previous prime is 18605838373. The next prime is 18605838401. The reversal of 18605838381 is 18383850681.

It is not a de Polignac number, because 18605838381 - 2³ = 18605838373 is a prime.

It is a super-2 number, since 2×18605838381² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18605838301) 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 15 ways as a sum of consecutive naturals, for example, 2106535 + ... + 2115348.

It is an arithmetic number, because the mean of its divisors is an integer number (1684531716).

Almost surely, 2^18605838381 is an apocalyptic number.

It is an amenable number.

18605838381 is a deficient number, since it is larger than the sum of its proper divisors (8346669075).

18605838381 is a wasteful number, since it uses less digits than its factorization.

18605838381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4222012.

The product of its (nonzero) digits is 1105920, while the sum is 51.

The spelling of 18605838381 in words is "eighteen billion, six hundred five million, eight hundred thirty-eight thousand, three hundred eighty-one".