66716171 has 4 divisors (see below), whose sum is σ = 68135712. Its totient is φ = 65296632.

The previous prime is 66716149. The next prime is 66716189. The reversal of 66716171 is 17161766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17161766 = 2 ⋅8580883.

It is a cyclic number.

It is not a de Polignac number, because 66716171 - 2¹⁰ = 66715147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66716101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 709700 + ... + 709793.

It is an arithmetic number, because the mean of its divisors is an integer number (17033928).

Almost surely, 2^66716171 is an apocalyptic number.

66716171 is a deficient number, since it is larger than the sum of its proper divisors (1419541).

66716171 is a wasteful number, since it uses less digits than its factorization.

66716171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419540.

The product of its digits is 10584, while the sum is 35.

The square root of 66716171 is about 8167.9967556311. The cubic root of 66716171 is about 405.5804733243.

The spelling of 66716171 in words is "sixty-six million, seven hundred sixteen thousand, one hundred seventy-one".