999216066 has 16 divisors (see below), whose sum is σ = 2003709600. Its totient is φ = 332192448.

The previous prime is 999216059. The next prime is 999216077. The reversal of 999216066 is 660612999.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217431 + ... + 221978.

It is an arithmetic number, because the mean of its divisors is an integer number (125231850).

Almost surely, 2^999216066 is an apocalyptic number.

999216066 is an abundant number, since it is smaller than the sum of its proper divisors (1004493534).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999216066 is a wasteful number, since it uses less digits than its factorization.

999216066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439793.

The product of its (nonzero) digits is 314928, while the sum is 48.

The square root of 999216066 is about 31610.3790866228. The cubic root of 999216066 is about 999.7386203533.

The spelling of 999216066 in words is "nine hundred ninety-nine million, two hundred sixteen thousand, sixty-six".