9988989566071 has 16 divisors (see below), whose sum is σ = 10446934821120. Its totient is φ = 9533035607040.

The previous prime is 9988989566057. The next prime is 9988989566147. The reversal of 9988989566071 is 1706659898899.

It is a cyclic number.

It is not a de Polignac number, because 9988989566071 - 2³¹ = 9986842082423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9988989566071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9988989566771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20598016 + ... + 21077386.

It is an arithmetic number, because the mean of its divisors is an integer number (652933426320).

Almost surely, 2^{9988989566071} is an apocalyptic number.

9988989566071 is a deficient number, since it is larger than the sum of its proper divisors (457945255049).

9988989566071 is a wasteful number, since it uses less digits than its factorization.

9988989566071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481446.

The product of its (nonzero) digits is 4232632320, while the sum is 85.

The spelling of 9988989566071 in words is "nine trillion, nine hundred eighty-eight billion, nine hundred eighty-nine million, five hundred sixty-six thousand, seventy-one".