66171241 has 2 divisors, whose sum is σ = 66171242. Its totient is φ = 66171240.

The previous prime is 66171227. The next prime is 66171251. The reversal of 66171241 is 14217166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38081241 + 28090000 = 6171^2 + 5300^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66171241 is a prime.

It is not a weakly prime, because it can be changed into another prime (66171221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33085620 + 33085621.

It is an arithmetic number, because the mean of its divisors is an integer number (33085621).

Almost surely, 2^66171241 is an apocalyptic number.

It is an amenable number.

66171241 is a deficient number, since it is larger than the sum of its proper divisors (1).

66171241 is an equidigital number, since it uses as much as digits as its factorization.

66171241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 28.

The square root of 66171241 is about 8134.5707323743. The cubic root of 66171241 is about 404.4732082958.

The spelling of 66171241 in words is "sixty-six million, one hundred seventy-one thousand, two hundred forty-one".