18668139908162 has 4 divisors (see below), whose sum is σ = 28002209862246. Its totient is φ = 9334069954080.

The previous prime is 18668139908161. The next prime is 18668139908203. The reversal of 18668139908162 is 26180993186681.

It is a happy number.

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., 14234163206761 + 4433976701401 = 3772819^2 + 2105701^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18668139908092 and 18668139908101.

It is not an unprimeable number, because it can be changed into a prime (18668139908161) 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, 4667034977039 + ... + 4667034977042.

Almost surely, 2^{18668139908162} is an apocalyptic number.

18668139908162 is a deficient number, since it is larger than the sum of its proper divisors (9334069954084).

18668139908162 is an equidigital number, since it uses as much as digits as its factorization.

18668139908162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9334069954083.

The product of its (nonzero) digits is 53747712, while the sum is 68.

The spelling of 18668139908162 in words is "eighteen trillion, six hundred sixty-eight billion, one hundred thirty-nine million, nine hundred eight thousand, one hundred sixty-two".