999900888006666 has 16 divisors (see below), whose sum is σ = 1999897173000864. Its totient is φ = 333284396504304.

The previous prime is 999900888006613. The next prime is 999900888006719. The reversal of 999900888006666 is 666600888009999.

It is an interprime number because it is at equal distance from previous prime (999900888006613) and next prime (999900888006719).

999900888006666 is a strobogrammatic number because it is the same when read upside-down.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3974738221 + ... + 3974989776.

It is an arithmetic number, because the mean of its divisors is an integer number (124993573312554).

Almost surely, 2^{999900888006666} is an apocalyptic number.

999900888006666 is an abundant number, since it is smaller than the sum of its proper divisors (999996284994198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999900888006666 is a wasteful number, since it uses less digits than its factorization.

999900888006666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7949748965.

The product of its (nonzero) digits is 4353564672, while the sum is 84.

The spelling of 999900888006666 in words is "nine hundred ninety-nine trillion, nine hundred billion, eight hundred eighty-eight million, six thousand, six hundred sixty-six".