9966321671 has 2 divisors, whose sum is σ = 9966321672. Its totient is φ = 9966321670.

The previous prime is 9966321647. The next prime is 9966321683. The reversal of 9966321671 is 1761236699.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9966321671 - 2³⁰ = 8892579847 is a prime.

It is a super-3 number, since 3×9966321671³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9966321641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4983160835 + 4983160836.

It is an arithmetic number, because the mean of its divisors is an integer number (4983160836).

Almost surely, 2^9966321671 is an apocalyptic number.

9966321671 is a deficient number, since it is larger than the sum of its proper divisors (1).

9966321671 is an equidigital number, since it uses as much as digits as its factorization.

9966321671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 50.

The square root of 9966321671 is about 99831.4663370222. The cubic root of 9966321671 is about 2152.0133777925.

The spelling of 9966321671 in words is "nine billion, nine hundred sixty-six million, three hundred twenty-one thousand, six hundred seventy-one".