99985666 has 16 divisors (see below), whose sum is σ = 166701888. Its totient is φ = 44590000.

The previous prime is 99985663. The next prime is 99985673. The reversal of 99985666 is 66658999.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 99985666.

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 7 ways as a sum of consecutive naturals, for example, 41710 + ... + 44041.

It is an arithmetic number, because the mean of its divisors is an integer number (10418868).

Almost surely, 2^99985666 is an apocalyptic number.

99985666 is a deficient number, since it is larger than the sum of its proper divisors (66716222).

99985666 is a wasteful number, since it uses less digits than its factorization.

99985666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85817.

The product of its digits is 6298560, while the sum is 58.

The square root of 99985666 is about 9999.2832743152. The cubic root of 99985666 is about 464.1367047901.

The spelling of 99985666 in words is "ninety-nine million, nine hundred eighty-five thousand, six hundred sixty-six".