99988888665 has 64 divisors (see below), whose sum is σ = 166617907200. Its totient is φ = 51172702464.

The previous prime is 99988888631. The next prime is 99988888717. The reversal of 99988888665 is 56688888999.

It is not a de Polignac number, because 99988888665 - 2⁷ = 99988888537 is a prime.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6712696 + ... + 6727574.

It is an arithmetic number, because the mean of its divisors is an integer number (2603404800).

Almost surely, 2^99988888665 is an apocalyptic number.

It is an amenable number.

99988888665 is a deficient number, since it is larger than the sum of its proper divisors (66629018535).

99988888665 is a wasteful number, since it uses less digits than its factorization.

99988888665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15126.

The product of its digits is 4299816960, while the sum is 84.

The spelling of 99988888665 in words is "ninety-nine billion, nine hundred eighty-eight million, eight hundred eighty-eight thousand, six hundred sixty-five".