9916985709 has 16 divisors (see below), whose sum is σ = 14799075840. Its totient is φ = 6563063520.

The previous prime is 9916985671. The next prime is 9916985731. The reversal of 9916985709 is 9075896199.

9916985709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9916985709 - 2⁸ = 9916985453 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9916985779) 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 15 ways as a sum of consecutive naturals, for example, 1336797 + ... + 1344194.

It is an arithmetic number, because the mean of its divisors is an integer number (924942240).

Almost surely, 2^9916985709 is an apocalyptic number.

It is an amenable number.

9916985709 is a deficient number, since it is larger than the sum of its proper divisors (4882090131).

9916985709 is a wasteful number, since it uses less digits than its factorization.

9916985709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2681137 (or 2681131 counting only the distinct ones).

The product of its (nonzero) digits is 11022480, while the sum is 63.

The square root of 9916985709 is about 99584.0635292615. The cubic root of 9916985709 is about 2148.4564879038.

The spelling of 9916985709 in words is "nine billion, nine hundred sixteen million, nine hundred eighty-five thousand, seven hundred nine".