18879779727698 has 8 divisors (see below), whose sum is σ = 29296209922380. Its totient is φ = 9114376420240.

The previous prime is 18879779727667. The next prime is 18879779727707. The reversal of 18879779727698 is 89672797797881.

It can be written as a sum of positive squares in 2 ways, for example, as 17281671637129 + 1598108090569 = 4157123^2 + 1264163^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18879779727698.

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 in 3 ways as a sum of consecutive naturals, for example, 162756721733 + ... + 162756721848.

Almost surely, 2^{18879779727698} is an apocalyptic number.

18879779727698 is a deficient number, since it is larger than the sum of its proper divisors (10416430194682).

18879779727698 is a wasteful number, since it uses less digits than its factorization.

18879779727698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325513443612.

The product of its digits is 75278149632, while the sum is 95.

The spelling of 18879779727698 in words is "eighteen trillion, eight hundred seventy-nine billion, seven hundred seventy-nine million, seven hundred twenty-seven thousand, six hundred ninety-eight".