999993666 has 48 divisors (see below), whose sum is σ = 2329512480. Its totient is φ = 285344640.

The previous prime is 999993653. The next prime is 999993671. The reversal of 999993666 is 666399999.

999993666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 999993597 and 999993606.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 294961 + ... + 298331.

It is an arithmetic number, because the mean of its divisors is an integer number (48531510).

Almost surely, 2^999993666 is an apocalyptic number.

999993666 is an abundant number, since it is smaller than the sum of its proper divisors (1329518814).

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

999993666 is a wasteful number, since it uses less digits than its factorization.

999993666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4399 (or 4392 counting only the distinct ones).

The product of its digits is 38263752, while the sum is 66.

The square root of 999993666 is about 31622.6764521917. The cubic root of 999993666 is about 999.9978886622.

The spelling of 999993666 in words is "nine hundred ninety-nine million, nine hundred ninety-three thousand, six hundred sixty-six".