999917668 has 12 divisors (see below), whose sum is σ = 1787087232. Its totient is φ = 489321320.

The previous prime is 999917623. The next prime is 999917669. The reversal of 999917668 is 866719999.

It is not an unprimeable number, because it can be changed into a prime (999917669) 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, 2659168 + ... + 2659543.

It is an arithmetic number, because the mean of its divisors is an integer number (148923936).

Almost surely, 2^999917668 is an apocalyptic number.

It is an amenable number.

999917668 is a deficient number, since it is larger than the sum of its proper divisors (787169564).

999917668 is a wasteful number, since it uses less digits than its factorization.

999917668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5318762 (or 5318760 counting only the distinct ones).

The product of its digits is 13226976, while the sum is 64.

The square root of 999917668 is about 31621.4747916665. The cubic root of 999917668 is about 999.9725552468.

The spelling of 999917668 in words is "nine hundred ninety-nine million, nine hundred seventeen thousand, six hundred sixty-eight".