66340633 has 2 divisors, whose sum is σ = 66340634. Its totient is φ = 66340632.

The previous prime is 66340621. The next prime is 66340639. The reversal of 66340633 is 33604366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41370624 + 24970009 = 6432^2 + 4997^2 .

It is a cyclic number.

It is not a de Polignac number, because 66340633 - 2⁹ = 66340121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66340595 and 66340604.

It is not a weakly prime, because it can be changed into another prime (66340639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33170316 + 33170317.

It is an arithmetic number, because the mean of its divisors is an integer number (33170317).

Almost surely, 2^66340633 is an apocalyptic number.

It is an amenable number.

66340633 is a deficient number, since it is larger than the sum of its proper divisors (1).

66340633 is an equidigital number, since it uses as much as digits as its factorization.

66340633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 31.

The square root of 66340633 is about 8144.9759361216. The cubic root of 66340633 is about 404.8180516857.

Adding to 66340633 its reverse (33604366), we get a palindrome (99944999).

The spelling of 66340633 in words is "sixty-six million, three hundred forty thousand, six hundred thirty-three".