66500003 has 2 divisors, whose sum is σ = 66500004. Its totient is φ = 66500002.

The previous prime is 66499967. The next prime is 66500009. The reversal of 66500003 is 30000566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66500003 - 2¹⁰ = 66498979 is a prime.

It is not a weakly prime, because it can be changed into another prime (66500009) 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, 33250001 + 33250002.

It is an arithmetic number, because the mean of its divisors is an integer number (33250002).

Almost surely, 2^66500003 is an apocalyptic number.

66500003 is a deficient number, since it is larger than the sum of its proper divisors (1).

66500003 is an equidigital number, since it uses as much as digits as its factorization.

66500003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 66500003 is about 8154.7533990918. The cubic root of 66500003 is about 405.1419570446.

Adding to 66500003 its reverse (30000566), we get a palindrome (96500569).

The spelling of 66500003 in words is "sixty-six million, five hundred thousand, three".