9886668891 has 16 divisors (see below), whose sum is σ = 14413092480. Its totient is φ = 5978385920.

The previous prime is 9886668889. The next prime is 9886668901. The reversal of 9886668891 is 1988666889.

It is a cyclic number.

It is not a de Polignac number, because 9886668891 - 2¹ = 9886668889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9886668811) 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, 323526 + ... + 352763.

It is an arithmetic number, because the mean of its divisors is an integer number (900818280).

Almost surely, 2^9886668891 is an apocalyptic number.

9886668891 is a deficient number, since it is larger than the sum of its proper divisors (4526423589).

9886668891 is a wasteful number, since it uses less digits than its factorization.

9886668891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676746.

The product of its digits is 71663616, while the sum is 69.

The square root of 9886668891 is about 99431.7297998984. The cubic root of 9886668891 is about 2146.2649331845.

The spelling of 9886668891 in words is "nine billion, eight hundred eighty-six million, six hundred sixty-eight thousand, eight hundred ninety-one".