66171473 has 2 divisors, whose sum is σ = 66171474. Its totient is φ = 66171472.

The previous prime is 66171461. The next prime is 66171481. The reversal of 66171473 is 37417166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49098049 + 17073424 = 7007^2 + 4132^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66171473 is a prime.

It is not a weakly prime, because it can be changed into another prime (66171173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33085736 + 33085737.

It is an arithmetic number, because the mean of its divisors is an integer number (33085737).

Almost surely, 2^66171473 is an apocalyptic number.

It is an amenable number.

66171473 is a deficient number, since it is larger than the sum of its proper divisors (1).

66171473 is an equidigital number, since it uses as much as digits as its factorization.

66171473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 35.

The square root of 66171473 is about 8134.5849924873. The cubic root of 66171473 is about 404.4736809970.

The spelling of 66171473 in words is "sixty-six million, one hundred seventy-one thousand, four hundred seventy-three".