66280171 has 4 divisors (see below), whose sum is σ = 66370600. Its totient is φ = 66189744.

The previous prime is 66280163. The next prime is 66280177. The reversal of 66280171 is 17108266.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66280171 - 2³ = 66280163 is a prime.

It is a super-2 number, since 2×66280171² = 8786122135578482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66280177) 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, 44106 + ... + 45583.

It is an arithmetic number, because the mean of its divisors is an integer number (16592650).

Almost surely, 2^66280171 is an apocalyptic number.

66280171 is a deficient number, since it is larger than the sum of its proper divisors (90429).

66280171 is an equidigital number, since it uses as much as digits as its factorization.

66280171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90428.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 66280171 is about 8141.2634768812. The cubic root of 66280171 is about 404.6950323161.

The spelling of 66280171 in words is "sixty-six million, two hundred eighty thousand, one hundred seventy-one".