66788171 has 2 divisors, whose sum is σ = 66788172. Its totient is φ = 66788170.

The previous prime is 66788093. The next prime is 66788203. The reversal of 66788171 is 17188766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66788171 - 2¹⁴ = 66771787 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66758171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33394085 + 33394086.

It is an arithmetic number, because the mean of its divisors is an integer number (33394086).

Almost surely, 2^66788171 is an apocalyptic number.

66788171 is a deficient number, since it is larger than the sum of its proper divisors (1).

66788171 is an equidigital number, since it uses as much as digits as its factorization.

66788171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 44.

The square root of 66788171 is about 8172.4030125784. The cubic root of 66788171 is about 405.7263215001.

The spelling of 66788171 in words is "sixty-six million, seven hundred eighty-eight thousand, one hundred seventy-one".