9009856666 has 16 divisors (see below), whose sum is σ = 13813309440. Its totient is φ = 4405572720.

The previous prime is 9009856663. The next prime is 9009856721. The reversal of 9009856666 is 6666589009.

It is not an unprimeable number, because it can be changed into a prime (9009856663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82756 + ... + 157696.

It is an arithmetic number, because the mean of its divisors is an integer number (863331840).

Almost surely, 2^9009856666 is an apocalyptic number.

9009856666 is a deficient number, since it is larger than the sum of its proper divisors (4803452774).

9009856666 is a wasteful number, since it uses less digits than its factorization.

9009856666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76269.

The product of its (nonzero) digits is 4199040, while the sum is 55.

The square root of 9009856666 is about 94920.2647804988. The cubic root of 9009856666 is about 2080.8429049519.

The spelling of 9009856666 in words is "nine billion, nine million, eight hundred fifty-six thousand, six hundred sixty-six".