66706171 has 8 divisors (see below), whose sum is σ = 77674464. Its totient is φ = 56097600.

The previous prime is 66706163. The next prime is 66706183. The reversal of 66706171 is 17160766.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66706171 - 2³ = 66706163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66706111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89530 + ... + 90271.

It is an arithmetic number, because the mean of its divisors is an integer number (9709308).

Almost surely, 2^66706171 is an apocalyptic number.

66706171 is a deficient number, since it is larger than the sum of its proper divisors (10968293).

66706171 is a wasteful number, since it uses less digits than its factorization.

66706171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179861.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 66706171 is about 8167.3845874919. The cubic root of 66706171 is about 405.5602083354.

The spelling of 66706171 in words is "sixty-six million, seven hundred six thousand, one hundred seventy-one".