18181383386 has 4 divisors (see below), whose sum is σ = 27272075082. Its totient is φ = 9090691692.

The previous prime is 18181383371. The next prime is 18181383403. The reversal of 18181383386 is 68338318181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17879701225 + 301682161 = 133715^2 + 17369^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4545345845 + ... + 4545345848.

Almost surely, 2^18181383386 is an apocalyptic number.

18181383386 is a deficient number, since it is larger than the sum of its proper divisors (9090691696).

18181383386 is an equidigital number, since it uses as much as digits as its factorization.

18181383386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9090691695.

The product of its digits is 663552, while the sum is 50.

The spelling of 18181383386 in words is "eighteen billion, one hundred eighty-one million, three hundred eighty-three thousand, three hundred eighty-six".