66047171 has 4 divisors (see below), whose sum is σ = 66063432. Its totient is φ = 66030912.

The previous prime is 66047161. The next prime is 66047209. The reversal of 66047171 is 17174066.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66047171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66047161) 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 in 3 ways as a sum of consecutive naturals, for example, 3731 + ... + 12083.

It is an arithmetic number, because the mean of its divisors is an integer number (16515858).

Almost surely, 2^66047171 is an apocalyptic number.

66047171 is a deficient number, since it is larger than the sum of its proper divisors (16261).

66047171 is an equidigital number, since it uses as much as digits as its factorization.

66047171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16260.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 66047171 is about 8126.9410604483. The cubic root of 66047171 is about 404.2202565754.

The spelling of 66047171 in words is "sixty-six million, forty-seven thousand, one hundred seventy-one".