99985665 has 16 divisors (see below), whose sum is σ = 172283328. Its totient is φ = 49223616.

The previous prime is 99985663. The next prime is 99985673. The reversal of 99985665 is 56658999.

It is not a de Polignac number, because 99985665 - 2¹ = 99985663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99985661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256179 + ... + 256568.

It is an arithmetic number, because the mean of its divisors is an integer number (10767708).

Almost surely, 2^99985665 is an apocalyptic number.

It is an amenable number.

99985665 is a deficient number, since it is larger than the sum of its proper divisors (72297663).

99985665 is a wasteful number, since it uses less digits than its factorization.

99985665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512768.

The product of its digits is 5248800, while the sum is 57.

The square root of 99985665 is about 9999.2832243116. The cubic root of 99985665 is about 464.1367032428.

The spelling of 99985665 in words is "ninety-nine million, nine hundred eighty-five thousand, six hundred sixty-five".