66271171 has 4 divisors (see below), whose sum is σ = 66331000. Its totient is φ = 66211344.

The previous prime is 66271103. The next prime is 66271189. The reversal of 66271171 is 17117266.

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 66271171 - 2⁷ = 66271043 is a prime.

It is a super-2 number, since 2×66271171² = 8783736211422482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66278171) 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, 28221 + ... + 30478.

It is an arithmetic number, because the mean of its divisors is an integer number (16582750).

Almost surely, 2^66271171 is an apocalyptic number.

66271171 is a deficient number, since it is larger than the sum of its proper divisors (59829).

66271171 is a wasteful number, since it uses less digits than its factorization.

66271171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59828.

The product of its digits is 3528, while the sum is 31.

The square root of 66271171 is about 8140.7107183587. The cubic root of 66271171 is about 404.6767140161.

The spelling of 66271171 in words is "sixty-six million, two hundred seventy-one thousand, one hundred seventy-one".