9916660687 has 4 divisors (see below), whose sum is σ = 10064670616. Its totient is φ = 9768650760.

The previous prime is 9916660679. The next prime is 9916660717. The reversal of 9916660687 is 7860666199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7860666199 = 47 ⋅167248217.

It is a cyclic number.

It is not a de Polignac number, because 9916660687 - 2³ = 9916660679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9916660087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74004864 + ... + 74004997.

It is an arithmetic number, because the mean of its divisors is an integer number (2516167654).

Almost surely, 2^9916660687 is an apocalyptic number.

9916660687 is a deficient number, since it is larger than the sum of its proper divisors (148009929).

9916660687 is a wasteful number, since it uses less digits than its factorization.

9916660687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148009928.

The product of its (nonzero) digits is 5878656, while the sum is 58.

The square root of 9916660687 is about 99582.4316182327. The cubic root of 9916660687 is about 2148.4330162807.

The spelling of 9916660687 in words is "nine billion, nine hundred sixteen million, six hundred sixty thousand, six hundred eighty-seven".