999999000666 has 48 divisors (see below), whose sum is σ = 2225426881704. Its totient is φ = 324294285312.

The previous prime is 999999000599. The next prime is 999999000667. The reversal of 999999000666 is 666000999999.

It can be written as a sum of positive squares in 4 ways, for example, as 963874296441 + 36124704225 = 981771^2 + 190065^2 .

It is a Curzon number.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 999999000594 and 999999000603.

It is not an unprimeable number, because it can be changed into a prime (999999000667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7897890 + ... + 8023506.

Almost surely, 2^999999000666 is an apocalyptic number.

999999000666 is an abundant number, since it is smaller than the sum of its proper divisors (1225427881038).

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

999999000666 is a wasteful number, since it uses less digits than its factorization.

999999000666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137615 (or 137612 counting only the distinct ones).

The product of its (nonzero) digits is 114791256, while the sum is 72.

The spelling of 999999000666 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, six hundred sixty-six", and thus it is an aban number.