989917666 has 8 divisors (see below), whose sum is σ = 1516469760. Its totient is φ = 484427748.

The previous prime is 989917603. The next prime is 989917673. The reversal of 989917666 is 666719989.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5265426 + ... + 5265613.

It is an arithmetic number, because the mean of its divisors is an integer number (189558720).

Almost surely, 2^989917666 is an apocalyptic number.

989917666 is a deficient number, since it is larger than the sum of its proper divisors (526552094).

989917666 is a wasteful number, since it uses less digits than its factorization.

989917666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10531088.

The product of its digits is 8817984, while the sum is 61.

The square root of 989917666 is about 31462.9570447534. The cubic root of 989917666 is about 996.6278634771.

The spelling of 989917666 in words is "nine hundred eighty-nine million, nine hundred seventeen thousand, six hundred sixty-six".