66161171 has 2 divisors, whose sum is σ = 66161172. Its totient is φ = 66161170.

The previous prime is 66161159. The next prime is 66161189. The reversal of 66161171 is 17116166.

66161171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66161171 - 2⁶ = 66161107 is a prime.

It is not a weakly prime, because it can be changed into another prime (66161131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33080585 + 33080586.

It is an arithmetic number, because the mean of its divisors is an integer number (33080586).

Almost surely, 2^66161171 is an apocalyptic number.

66161171 is a deficient number, since it is larger than the sum of its proper divisors (1).

66161171 is an equidigital number, since it uses as much as digits as its factorization.

66161171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 29.

The square root of 66161171 is about 8133.9517456154. The cubic root of 66161171 is about 404.4526895539.

The spelling of 66161171 in words is "sixty-six million, one hundred sixty-one thousand, one hundred seventy-one".