99988888666 has 4 divisors (see below), whose sum is σ = 149983333002. Its totient is φ = 49994444332.

The previous prime is 99988888631. The next prime is 99988888717. The reversal of 99988888666 is 66688888999.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 89457819025 + 10531069641 = 299095^2 + 102621^2 .

99988888666 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 as a sum of consecutive naturals, namely, 24997222165 + ... + 24997222168.

Almost surely, 2^99988888666 is an apocalyptic number.

99988888666 is a deficient number, since it is larger than the sum of its proper divisors (49994444336).

99988888666 is a wasteful number, since it uses less digits than its factorization.

99988888666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49994444335.

The product of its digits is 5159780352, while the sum is 85.

The spelling of 99988888666 in words is "ninety-nine billion, nine hundred eighty-eight million, eight hundred eighty-eight thousand, six hundred sixty-six".