9666988831 has 2 divisors, whose sum is σ = 9666988832. Its totient is φ = 9666988830.

The previous prime is 9666988787. The next prime is 9666988873. The reversal of 9666988831 is 1388896669.

It is a strong prime.

It is an emirp because it is prime and its reverse (1388896669) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9666988831 - 2⁹ = 9666988319 is a prime.

It is a super-2 number, since 2×9666988831² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9666988231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4833494415 + 4833494416.

It is an arithmetic number, because the mean of its divisors is an integer number (4833494416).

Almost surely, 2^9666988831 is an apocalyptic number.

9666988831 is a deficient number, since it is larger than the sum of its proper divisors (1).

9666988831 is an equidigital number, since it uses as much as digits as its factorization.

9666988831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26873856, while the sum is 64.

The square root of 9666988831 is about 98320.8463704417. The cubic root of 9666988831 is about 2130.2491741236.

The spelling of 9666988831 in words is "nine billion, six hundred sixty-six million, nine hundred eighty-eight thousand, eight hundred thirty-one".