66506303 has 2 divisors, whose sum is σ = 66506304. Its totient is φ = 66506302.

The previous prime is 66506281. The next prime is 66506311. The reversal of 66506303 is 30360566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66506303 - 2⁸ = 66506047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66506333) 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, 33253151 + 33253152.

It is an arithmetic number, because the mean of its divisors is an integer number (33253152).

Almost surely, 2^66506303 is an apocalyptic number.

66506303 is a deficient number, since it is larger than the sum of its proper divisors (1).

66506303 is an equidigital number, since it uses as much as digits as its factorization.

66506303 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 66506303 is about 8155.1396677188. The cubic root of 66506303 is about 405.1547505965.

Adding to 66506303 its reverse (30360566), we get a palindrome (96866869).

The spelling of 66506303 in words is "sixty-six million, five hundred six thousand, three hundred three".