18388286666 has 8 divisors (see below), whose sum is σ = 27583117380. Its totient is φ = 9193914208.

The previous prime is 18388286641. The next prime is 18388286681. The reversal of 18388286666 is 66668288381.

It can be written as a sum of positive squares in 2 ways, for example, as 17871679225 + 516607441 = 133685^2 + 22729^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 18388286599 and 18388286608.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15110 + ... + 192366.

Almost surely, 2^18388286666 is an apocalyptic number.

18388286666 is a deficient number, since it is larger than the sum of its proper divisors (9194830714).

18388286666 is a wasteful number, since it uses less digits than its factorization.

18388286666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229128.

The product of its digits is 31850496, while the sum is 62.

The spelling of 18388286666 in words is "eighteen billion, three hundred eighty-eight million, two hundred eighty-six thousand, six hundred sixty-six".