18279555556 has 6 divisors (see below), whose sum is σ = 31989222230. Its totient is φ = 9139777776.

The previous prime is 18279555551. The next prime is 18279555577. The reversal of 18279555556 is 65555597281.

It can be written as a sum of positive squares in only one way, i.e., 18268225600 + 11329956 = 135160^2 + 3366^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18279555556.

It is not an unprimeable number, because it can be changed into a prime (18279555551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2284944441 + ... + 2284944448.

Almost surely, 2^18279555556 is an apocalyptic number.

It is an amenable number.

18279555556 is a deficient number, since it is larger than the sum of its proper divisors (13709666674).

18279555556 is a wasteful number, since it uses less digits than its factorization.

18279555556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4569888893 (or 4569888891 counting only the distinct ones).

The product of its digits is 18900000, while the sum is 58.

The spelling of 18279555556 in words is "eighteen billion, two hundred seventy-nine million, five hundred fifty-five thousand, five hundred fifty-six".