999609666 has 32 divisors (see below), whose sum is σ = 2182118400. Its totient is φ = 302752080.

The previous prime is 999609661. The next prime is 999609763. The reversal of 999609666 is 666906999.

999609666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

999609666 is a strobogrammatic number because it is the same when read upside-down.

It is not an unprimeable number, because it can be changed into a prime (999609661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200755 + ... + 205673.

It is an arithmetic number, because the mean of its divisors is an integer number (68191200).

Almost surely, 2^999609666 is an apocalyptic number.

999609666 is an abundant number, since it is smaller than the sum of its proper divisors (1182508734).

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

999609666 is a wasteful number, since it uses less digits than its factorization.

999609666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8014.

The product of its (nonzero) digits is 8503056, while the sum is 60.

The square root of 999609666 is about 31616.6042768669. The cubic root of 999609666 is about 999.8698717340.

The spelling of 999609666 in words is "nine hundred ninety-nine million, six hundred nine thousand, six hundred sixty-six".