99866665 has 8 divisors (see below), whose sum is σ = 121357440. Its totient is φ = 78881712.

The previous prime is 99866659. The next prime is 99866707. The reversal of 99866665 is 56666899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99866665 - 2¹⁹ = 99342377 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 7 ways as a sum of consecutive naturals, for example, 126019 + ... + 126808.

It is an arithmetic number, because the mean of its divisors is an integer number (15169680).

Almost surely, 2^99866665 is an apocalyptic number.

It is an amenable number.

99866665 is a deficient number, since it is larger than the sum of its proper divisors (21490775).

99866665 is a wasteful number, since it uses less digits than its factorization.

99866665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252911.

The product of its digits is 4199040, while the sum is 55.

The square root of 99866665 is about 9993.3310262394. The cubic root of 99866665 is about 463.9524961896.

The spelling of 99866665 in words is "ninety-nine million, eight hundred sixty-six thousand, six hundred sixty-five".