999988886666 has 64 divisors (see below), whose sum is σ = 1889413910784. Its totient is φ = 385587456000.

The previous prime is 999988886569. The next prime is 999988886681. The reversal of 999988886666 is 666688889999.

999988886666 is a strobogrammatic number because it is the same when read upside-down.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41314880 + ... + 41339076.

It is an arithmetic number, because the mean of its divisors is an integer number (29522092356).

Almost surely, 2^999988886666 is an apocalyptic number.

999988886666 is a deficient number, since it is larger than the sum of its proper divisors (889425024118).

999988886666 is a wasteful number, since it uses less digits than its factorization.

999988886666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26975.

The product of its digits is 34828517376, while the sum is 92.

The spelling of 999988886666 in words is "nine hundred ninety-nine billion, nine hundred eighty-eight million, eight hundred eighty-six thousand, six hundred sixty-six".