9966305281 has 2 divisors, whose sum is σ = 9966305282. Its totient is φ = 9966305280.

The previous prime is 9966305269. The next prime is 9966305309. The reversal of 9966305281 is 1825036699.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9147200881 + 819104400 = 95641^2 + 28620^2 .

It is an emirp because it is prime and its reverse (1825036699) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9966305281 is a prime.

It is a super-2 number, since 2×9966305281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9966305221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4983152640 + 4983152641.

It is an arithmetic number, because the mean of its divisors is an integer number (4983152641).

Almost surely, 2^9966305281 is an apocalyptic number.

It is an amenable number.

9966305281 is a deficient number, since it is larger than the sum of its proper divisors (1).

9966305281 is an equidigital number, since it uses as much as digits as its factorization.

9966305281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 699840, while the sum is 49.

The square root of 9966305281 is about 99831.3842486420. The cubic root of 9966305281 is about 2152.0121981022.

The spelling of 9966305281 in words is "nine billion, nine hundred sixty-six million, three hundred five thousand, two hundred eighty-one".