66443017 has 2 divisors, whose sum is σ = 66443018. Its totient is φ = 66443016.

The previous prime is 66442997. The next prime is 66443051. The reversal of 66443017 is 71034466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55294096 + 11148921 = 7436^2 + 3339^2 .

It is a cyclic number.

It is not a de Polignac number, because 66443017 - 2¹⁵ = 66410249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66443017.

It is not a weakly prime, because it can be changed into another prime (66449017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33221508 + 33221509.

It is an arithmetic number, because the mean of its divisors is an integer number (33221509).

Almost surely, 2^66443017 is an apocalyptic number.

It is an amenable number.

66443017 is a deficient number, since it is larger than the sum of its proper divisors (1).

66443017 is an equidigital number, since it uses as much as digits as its factorization.

66443017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 66443017 is about 8151.2586144718. The cubic root of 66443017 is about 405.0261975636.

It can be divided in two parts, 664 and 43017, that added together give a square (43681 = 209²).

The spelling of 66443017 in words is "sixty-six million, four hundred forty-three thousand, seventeen".