9866009904 has 80 divisors (see below), whose sum is σ = 26369740800. Its totient is φ = 3175280640.

The previous prime is 9866009869. The next prime is 9866009941. The reversal of 9866009904 is 4099006689.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 660729 + ... + 675495.

It is an arithmetic number, because the mean of its divisors is an integer number (329621760).

Almost surely, 2^9866009904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9866009904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13184870400).

9866009904 is an abundant number, since it is smaller than the sum of its proper divisors (16503730896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9866009904 is a wasteful number, since it uses less digits than its factorization.

9866009904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15258 (or 15252 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 51.

The square root of 9866009904 is about 99327.7901898557. The cubic root of 9866009904 is about 2144.7689598524.

The spelling of 9866009904 in words is "nine billion, eight hundred sixty-six million, nine thousand, nine hundred four".