999999986666666 has 32 divisors (see below), whose sum is σ = 1582416000000000. Its totient is φ = 472644688490352.

The previous prime is 999999986666623. The next prime is 999999986666677. The reversal of 999999986666666 is 666666689999999.

It is a Smith number, since the sum of its digits (113) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

999999986666666 is a strobogrammatic number because it is the same when read upside-down.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18333335 + ... + 48333333.

It is an arithmetic number, because the mean of its divisors is an integer number (49450500000000).

Almost surely, 2^{999999986666666} is an apocalyptic number.

999999986666666 is a deficient number, since it is larger than the sum of its proper divisors (582416013333334).

999999986666666 is a wasteful number, since it uses less digits than its factorization.

999999986666666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30001946.

The product of its digits is 10711401679872, while the sum is 113.

The spelling of 999999986666666 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred eighty-six million, six hundred sixty-six thousand, six hundred sixty-six".