9916660686 has 16 divisors (see below), whose sum is σ = 19896690384. Its totient is φ = 3294992064.

The previous prime is 9916660679. The next prime is 9916660717. The reversal of 9916660686 is 6860666199.

It is a super-2 number, since 2×9916660686² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2638341 + ... + 2642096.

It is an arithmetic number, because the mean of its divisors is an integer number (1243543149).

Almost surely, 2^9916660686 is an apocalyptic number.

9916660686 is an abundant number, since it is smaller than the sum of its proper divisors (9980029698).

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

9916660686 is a wasteful number, since it uses less digits than its factorization.

9916660686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5280755.

The product of its (nonzero) digits is 5038848, while the sum is 57.

The square root of 9916660686 is about 99582.4316132118. The cubic root of 9916660686 is about 2148.4330162085.

The spelling of 9916660686 in words is "nine billion, nine hundred sixteen million, six hundred sixty thousand, six hundred eighty-six".