66500503 has 2 divisors, whose sum is σ = 66500504. Its totient is φ = 66500502.

The previous prime is 66500501. The next prime is 66500543. The reversal of 66500503 is 30500566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66500503 - 2¹ = 66500501 is a prime.

Together with 66500501, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66500501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33250251 + 33250252.

It is an arithmetic number, because the mean of its divisors is an integer number (33250252).

Almost surely, 2^66500503 is an apocalyptic number.

66500503 is a deficient number, since it is larger than the sum of its proper divisors (1).

66500503 is an equidigital number, since it uses as much as digits as its factorization.

66500503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 66500503 is about 8154.7840560005. The cubic root of 66500503 is about 405.1429724353.

The spelling of 66500503 in words is "sixty-six million, five hundred thousand, five hundred three".