18214786138 has 4 divisors (see below), whose sum is σ = 27322179210. Its totient is φ = 9107393068.

The previous prime is 18214786133. The next prime is 18214786159. The reversal of 18214786138 is 83168741281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83168741281 = 2377 ⋅34988953.

It can be written as a sum of positive squares in only one way, i.e., 13443706809 + 4771079329 = 115947^2 + 69073^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 18214786091 and 18214786100.

It is not an unprimeable number, because it can be changed into a prime (18214786133) by changing a digit.

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, 4553696533 + ... + 4553696536.

Almost surely, 2^18214786138 is an apocalyptic number.

18214786138 is a deficient number, since it is larger than the sum of its proper divisors (9107393072).

18214786138 is an equidigital number, since it uses as much as digits as its factorization.

18214786138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9107393071.

The product of its digits is 516096, while the sum is 49.

The spelling of 18214786138 in words is "eighteen billion, two hundred fourteen million, seven hundred eighty-six thousand, one hundred thirty-eight".