99999988666666 has 16 divisors (see below), whose sum is σ = 163654900385760. Its totient is φ = 45449386054480.

The previous prime is 99999988666663. The next prime is 99999988666667. The reversal of 99999988666666 is 66666688999999.

99999988666666 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 (99999988666663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257514001 + ... + 257902036.

It is an arithmetic number, because the mean of its divisors is an integer number (10228431274110).

Almost surely, 2^{99999988666666} is an apocalyptic number.

99999988666666 is a deficient number, since it is larger than the sum of its proper divisors (63654911719094).

99999988666666 is a wasteful number, since it uses less digits than its factorization.

99999988666666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515424869.

The product of its digits is 1586874322944, while the sum is 106.

The spelling of 99999988666666 in words is "ninety-nine trillion, nine hundred ninety-nine billion, nine hundred eighty-eight million, six hundred sixty-six thousand, six hundred sixty-six".