9666889997 has 4 divisors (see below), whose sum is σ = 9686578656. Its totient is φ = 9647201340.

The previous prime is 9666889963. The next prime is 9666890033. The reversal of 9666889997 is 7999886669.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7999886669 = 29 ⋅275858161.

It is a cyclic number.

It is not a de Polignac number, because 9666889997 - 2¹⁴ = 9666873613 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 (9666880997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9843593 + ... + 9844574.

It is an arithmetic number, because the mean of its divisors is an integer number (2421644664).

Almost surely, 2^9666889997 is an apocalyptic number.

It is an amenable number.

9666889997 is a deficient number, since it is larger than the sum of its proper divisors (19688659).

9666889997 is a wasteful number, since it uses less digits than its factorization.

9666889997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19688658.

The product of its digits is 634894848, while the sum is 77.

The square root of 9666889997 is about 98320.3437595699. The cubic root of 9666889997 is about 2130.2419143047.

The spelling of 9666889997 in words is "nine billion, six hundred sixty-six million, eight hundred eighty-nine thousand, nine hundred ninety-seven".