9847999666 has 16 divisors (see below), whose sum is σ = 15667084800. Its totient is φ = 4626606400.

The previous prime is 9847999663. The next prime is 9847999673. The reversal of 9847999666 is 6669997489.

9847999666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×9847999666² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9847999663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221410 + ... + 262141.

It is an arithmetic number, because the mean of its divisors is an integer number (979192800).

Almost surely, 2^9847999666 is an apocalyptic number.

9847999666 is a deficient number, since it is larger than the sum of its proper divisors (5819085134).

9847999666 is a wasteful number, since it uses less digits than its factorization.

9847999666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484169.

The product of its digits is 317447424, while the sum is 73.

The square root of 9847999666 is about 99237.0881576037. The cubic root of 9847999666 is about 2143.4630848172.

The spelling of 9847999666 in words is "nine billion, eight hundred forty-seven million, nine hundred ninety-nine thousand, six hundred sixty-six".