18021352186 has 4 divisors (see below), whose sum is σ = 27032028282. Its totient is φ = 9010676092.

The previous prime is 18021352157. The next prime is 18021352213. The reversal of 18021352186 is 68125312081.

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., 10079156025 + 7942196161 = 100395^2 + 89119^2 .

It is a super-2 number, since 2×18021352186² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4505338045 + ... + 4505338048.

Almost surely, 2^18021352186 is an apocalyptic number.

18021352186 is a deficient number, since it is larger than the sum of its proper divisors (9010676096).

18021352186 is an equidigital number, since it uses as much as digits as its factorization.

18021352186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9010676095.

The product of its (nonzero) digits is 23040, while the sum is 37.

The spelling of 18021352186 in words is "eighteen billion, twenty-one million, three hundred fifty-two thousand, one hundred eighty-six".