18192918218 has 4 divisors (see below), whose sum is σ = 27289377330. Its totient is φ = 9096459108.

The previous prime is 18192918217. The next prime is 18192918257. The reversal of 18192918218 is 81281929181.

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., 17324614129 + 868304089 = 131623^2 + 29467^2 .

It is not an unprimeable number, because it can be changed into a prime (18192918217) 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 as a sum of consecutive naturals, namely, 4548229553 + ... + 4548229556.

Almost surely, 2^18192918218 is an apocalyptic number.

18192918218 is a deficient number, since it is larger than the sum of its proper divisors (9096459112).

18192918218 is an equidigital number, since it uses as much as digits as its factorization.

18192918218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9096459111.

The product of its digits is 165888, while the sum is 50.

The spelling of 18192918218 in words is "eighteen billion, one hundred ninety-two million, nine hundred eighteen thousand, two hundred eighteen".