66555241 has 2 divisors, whose sum is σ = 66555242. Its totient is φ = 66555240.

The previous prime is 66555199. The next prime is 66555299. The reversal of 66555241 is 14255566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65545216 + 1010025 = 8096^2 + 1005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66555241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66555197 and 66555206.

It is not a weakly prime, because it can be changed into another prime (66550241) 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 as a sum of consecutive naturals, namely, 33277620 + 33277621.

It is an arithmetic number, because the mean of its divisors is an integer number (33277621).

Almost surely, 2^66555241 is an apocalyptic number.

It is an amenable number.

66555241 is a deficient number, since it is larger than the sum of its proper divisors (1).

66555241 is an equidigital number, since it uses as much as digits as its factorization.

66555241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36000, while the sum is 34.

The square root of 66555241 is about 8158.1395550701. The cubic root of 66555241 is about 405.2541025927.

The spelling of 66555241 in words is "sixty-six million, five hundred fifty-five thousand, two hundred forty-one".