216066899 has 4 divisors (see below), whose sum is σ = 225461136. Its totient is φ = 206672664.

The previous prime is 216066887. The next prime is 216066901. The reversal of 216066899 is 998660612.

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

It is not a de Polignac number, because 216066899 - 2²⁴ = 199289683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216066299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4697084 + ... + 4697129.

It is an arithmetic number, because the mean of its divisors is an integer number (56365284).

Almost surely, 2^216066899 is an apocalyptic number.

216066899 is a deficient number, since it is larger than the sum of its proper divisors (9394237).

216066899 is an equidigital number, since it uses as much as digits as its factorization.

216066899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9394236.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 216066899 is about 14699.2142306995. The cubic root of 216066899 is about 600.0619371246.

The spelling of 216066899 in words is "two hundred sixteen million, sixty-six thousand, eight hundred ninety-nine".