9945782761171 has 2 divisors, whose sum is σ = 9945782761172. Its totient is φ = 9945782761170.

The previous prime is 9945782761147. The next prime is 9945782761193. The reversal of 9945782761171 is 1711672875499.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9945782761171 - 2¹¹ = 9945782759123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9945782761097 and 9945782761106.

It is not a weakly prime, because it can be changed into another prime (9945782762171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4972891380585 + 4972891380586.

It is an arithmetic number, because the mean of its divisors is an integer number (4972891380586).

Almost surely, 2^{9945782761171} is an apocalyptic number.

9945782761171 is a deficient number, since it is larger than the sum of its proper divisors (1).

9945782761171 is an equidigital number, since it uses as much as digits as its factorization.

9945782761171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53343360, while the sum is 67.

The spelling of 9945782761171 in words is "nine trillion, nine hundred forty-five billion, seven hundred eighty-two million, seven hundred sixty-one thousand, one hundred seventy-one".