66775171 has 4 divisors (see below), whose sum is σ = 66855600. Its totient is φ = 66694744.

The previous prime is 66775153. The next prime is 66775193. The reversal of 66775171 is 17157766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17157766 = 2 ⋅8578883.

It is a cyclic number.

It is not a de Polignac number, because 66775171 - 2⁷ = 66775043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66775871) 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, 38956 + ... + 40633.

It is an arithmetic number, because the mean of its divisors is an integer number (16713900).

Almost surely, 2^66775171 is an apocalyptic number.

66775171 is a deficient number, since it is larger than the sum of its proper divisors (80429).

66775171 is an equidigital number, since it uses as much as digits as its factorization.

66775171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80428.

The product of its digits is 61740, while the sum is 40.

The square root of 66775171 is about 8171.6076141724. The cubic root of 66775171 is about 405.6999955587.

The spelling of 66775171 in words is "sixty-six million, seven hundred seventy-five thousand, one hundred seventy-one".