66517303 has 2 divisors, whose sum is σ = 66517304. Its totient is φ = 66517302.

The previous prime is 66517291. The next prime is 66517307. The reversal of 66517303 is 30371566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66517303 - 2²¹ = 64420151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66517307) 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, 33258651 + 33258652.

It is an arithmetic number, because the mean of its divisors is an integer number (33258652).

Almost surely, 2^66517303 is an apocalyptic number.

66517303 is a deficient number, since it is larger than the sum of its proper divisors (1).

66517303 is an equidigital number, since it uses as much as digits as its factorization.

66517303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 31.

The square root of 66517303 is about 8155.8140611468. The cubic root of 66517303 is about 405.1770866076.

Adding to 66517303 its reverse (30371566), we get a palindrome (96888869).

The spelling of 66517303 in words is "sixty-six million, five hundred seventeen thousand, three hundred three".