66020243 has 2 divisors, whose sum is σ = 66020244. Its totient is φ = 66020242.

The previous prime is 66020203. The next prime is 66020287. The reversal of 66020243 is 34202066.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66020243 is a prime.

It is not a weakly prime, because it can be changed into another prime (66020203) 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, 33010121 + 33010122.

It is an arithmetic number, because the mean of its divisors is an integer number (33010122).

Almost surely, 2^66020243 is an apocalyptic number.

66020243 is a deficient number, since it is larger than the sum of its proper divisors (1).

66020243 is an equidigital number, since it uses as much as digits as its factorization.

66020243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 66020243 is about 8125.2841796457. The cubic root of 66020243 is about 404.1653144155.

The spelling of 66020243 in words is "sixty-six million, twenty thousand, two hundred forty-three".