66572171 has 2 divisors, whose sum is σ = 66572172. Its totient is φ = 66572170.

The previous prime is 66572141. The next prime is 66572183. The reversal of 66572171 is 17127566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66572171 - 2¹⁰ = 66571147 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66572111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33286085 + 33286086.

It is an arithmetic number, because the mean of its divisors is an integer number (33286086).

Almost surely, 2^66572171 is an apocalyptic number.

66572171 is a deficient number, since it is larger than the sum of its proper divisors (1).

66572171 is an equidigital number, since it uses as much as digits as its factorization.

66572171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17640, while the sum is 35.

The square root of 66572171 is about 8159.1771031152. The cubic root of 66572171 is about 405.2884618718.

The spelling of 66572171 in words is "sixty-six million, five hundred seventy-two thousand, one hundred seventy-one".