999000000668 has 12 divisors (see below), whose sum is σ = 1772198631840. Its totient is φ = 492657534432.

The previous prime is 999000000667. The next prime is 999000000673. The reversal of 999000000668 is 866000000999.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999000000667) 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, 1710616148 + ... + 1710616731.

It is an arithmetic number, because the mean of its divisors is an integer number (147683219320).

Almost surely, 2^999000000668 is an apocalyptic number.

It is an amenable number.

999000000668 is a deficient number, since it is larger than the sum of its proper divisors (773198631172).

999000000668 is a wasteful number, since it uses less digits than its factorization.

999000000668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3421232956 (or 3421232954 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 47.

The spelling of 999000000668 in words is "nine hundred ninety-nine billion, six hundred sixty-eight", and thus it is an aban number.