99998888886666 has 192 divisors, whose sum is σ = 281583046757376. Its totient is φ = 25839156556800.

The previous prime is 99998888886643. The next prime is 99998888886667. The reversal of 99998888886666 is 66668888889999.

99998888886666 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 not an unprimeable number, because it can be changed into a prime (99998888886667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 299661 + ... + 14145231.

It is an arithmetic number, because the mean of its divisors is an integer number (1466578368528).

Almost surely, 2^{99998888886666} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99998888886666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140791523378688).

99998888886666 is an abundant number, since it is smaller than the sum of its proper divisors (181584157870710).

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

99998888886666 is a wasteful number, since it uses less digits than its factorization.

99998888886666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13845799 (or 13845787 counting only the distinct ones).

The product of its digits is 2229025112064, while the sum is 108.

The spelling of 99998888886666 in words is "ninety-nine trillion, nine hundred ninety-eight billion, eight hundred eighty-eight million, eight hundred eighty-six thousand, six hundred sixty-six".