66717241 has 2 divisors, whose sum is σ = 66717242. Its totient is φ = 66717240.

The previous prime is 66717223. The next prime is 66717247. The reversal of 66717241 is 14271766.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55353600 + 11363641 = 7440^2 + 3371^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66717241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66717197 and 66717206.

It is not a weakly prime, because it can be changed into another prime (66717247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33358620 + 33358621.

It is an arithmetic number, because the mean of its divisors is an integer number (33358621).

Almost surely, 2^66717241 is an apocalyptic number.

It is an amenable number.

66717241 is a deficient number, since it is larger than the sum of its proper divisors (1).

66717241 is an equidigital number, since it uses as much as digits as its factorization.

66717241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 34.

The square root of 66717241 is about 8168.0622549048. The cubic root of 66717241 is about 405.5826415581.

The spelling of 66717241 in words is "sixty-six million, seven hundred seventeen thousand, two hundred forty-one".