66630533 has 2 divisors, whose sum is σ = 66630534. Its totient is φ = 66630532.

The previous prime is 66630523. The next prime is 66630539. The reversal of 66630533 is 33503666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53684929 + 12945604 = 7327^2 + 3598^2 .

It is a cyclic number.

It is not a de Polignac number, because 66630533 - 2¹² = 66626437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66630533.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66630539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33315266 + 33315267.

It is an arithmetic number, because the mean of its divisors is an integer number (33315267).

Almost surely, 2^66630533 is an apocalyptic number.

It is an amenable number.

66630533 is a deficient number, since it is larger than the sum of its proper divisors (1).

66630533 is an equidigital number, since it uses as much as digits as its factorization.

66630533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 32.

The square root of 66630533 is about 8162.7527832221. The cubic root of 66630533 is about 405.4068623791.

The spelling of 66630533 in words is "sixty-six million, six hundred thirty thousand, five hundred thirty-three".