66506333 has 2 divisors, whose sum is σ = 66506334. Its totient is φ = 66506332.

The previous prime is 66506311. The next prime is 66506351. The reversal of 66506333 is 33360566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64032004 + 2474329 = 8002^2 + 1573^2 .

It is a cyclic number.

It is not a de Polignac number, because 66506333 - 2¹⁶ = 66440797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66506333.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66506303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33253166 + 33253167.

It is an arithmetic number, because the mean of its divisors is an integer number (33253167).

Almost surely, 2^66506333 is an apocalyptic number.

It is an amenable number.

66506333 is a deficient number, since it is larger than the sum of its proper divisors (1).

66506333 is an equidigital number, since it uses as much as digits as its factorization.

66506333 is an evil number, because the sum of its binary digits is even.

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

The square root of 66506333 is about 8155.1415070494. The cubic root of 66506333 is about 405.1548115163.

Adding to 66506333 its reverse (33360566), we get a palindrome (99866899).

The spelling of 66506333 in words is "sixty-six million, five hundred six thousand, three hundred thirty-three".