66630503 has 2 divisors, whose sum is σ = 66630504. Its totient is φ = 66630502.

The previous prime is 66630481. The next prime is 66630523. The reversal of 66630503 is 30503666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66630503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66630523) 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, 33315251 + 33315252.

It is an arithmetic number, because the mean of its divisors is an integer number (33315252).

Almost surely, 2^66630503 is an apocalyptic number.

66630503 is a deficient number, since it is larger than the sum of its proper divisors (1).

66630503 is an equidigital number, since it uses as much as digits as its factorization.

66630503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 29.

The square root of 66630503 is about 8162.7509456065. The cubic root of 66630503 is about 405.4068015351.

The spelling of 66630503 in words is "sixty-six million, six hundred thirty thousand, five hundred three".