18806385381 has 16 divisors (see below), whose sum is σ = 28660084224. Its totient is φ = 10745480304.

The previous prime is 18806385361. The next prime is 18806385397. The reversal of 18806385381 is 18358360881.

It is not a de Polignac number, because 18806385381 - 2¹³ = 18806377189 is a prime.

It is a super-2 number, since 2×18806385381² (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 (18806385361) 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, 220146 + ... + 293388.

It is an arithmetic number, because the mean of its divisors is an integer number (1791255264).

Almost surely, 2^18806385381 is an apocalyptic number.

It is an amenable number.

18806385381 is a deficient number, since it is larger than the sum of its proper divisors (9853698843).

18806385381 is a wasteful number, since it uses less digits than its factorization.

18806385381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85480.

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

The spelling of 18806385381 in words is "eighteen billion, eight hundred six million, three hundred eighty-five thousand, three hundred eighty-one".