16661125112171 has 2 divisors, whose sum is σ = 16661125112172. Its totient is φ = 16661125112170.

The previous prime is 16661125112141. The next prime is 16661125112239. The reversal of 16661125112171 is 17121152116661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16661125112171 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (16661125112141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330562556085 + 8330562556086.

It is an arithmetic number, because the mean of its divisors is an integer number (8330562556086).

Almost surely, 2^{16661125112171} is an apocalyptic number.

16661125112171 is a deficient number, since it is larger than the sum of its proper divisors (1).

16661125112171 is an equidigital number, since it uses as much as digits as its factorization.

16661125112171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 41.

The spelling of 16661125112171 in words is "sixteen trillion, six hundred sixty-one billion, one hundred twenty-five million, one hundred twelve thousand, one hundred seventy-one".