66303623 has 2 divisors, whose sum is σ = 66303624. Its totient is φ = 66303622.

The previous prime is 66303617. The next prime is 66303649. The reversal of 66303623 is 32630366.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66303623 - 2²² = 62109319 is a prime.

It is a super-3 number, since 3×66303623³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66303613) 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, 33151811 + 33151812.

It is an arithmetic number, because the mean of its divisors is an integer number (33151812).

Almost surely, 2^66303623 is an apocalyptic number.

66303623 is a deficient number, since it is larger than the sum of its proper divisors (1).

66303623 is an equidigital number, since it uses as much as digits as its factorization.

66303623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 29.

The square root of 66303623 is about 8142.7036664734. The cubic root of 66303623 is about 404.7427579459.

Adding to 66303623 its reverse (32630366), we get a palindrome (98933989).

The spelling of 66303623 in words is "sixty-six million, three hundred three thousand, six hundred twenty-three".