66609233 has 2 divisors, whose sum is σ = 66609234. Its totient is φ = 66609232.

The previous prime is 66609229. The next prime is 66609239. The reversal of 66609233 is 33290666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53699584 + 12909649 = 7328^2 + 3593^2 .

It is a cyclic number.

It is not a de Polignac number, because 66609233 - 2² = 66609229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66609193 and 66609202.

It is not a weakly prime, because it can be changed into another prime (66609239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33304616 + 33304617.

It is an arithmetic number, because the mean of its divisors is an integer number (33304617).

Almost surely, 2^66609233 is an apocalyptic number.

It is an amenable number.

66609233 is a deficient number, since it is larger than the sum of its proper divisors (1).

66609233 is an equidigital number, since it uses as much as digits as its factorization.

66609233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 35.

The square root of 66609233 is about 8161.4479720207. The cubic root of 66609233 is about 405.3636585300.

Adding to 66609233 its reverse (33290666), we get a palindrome (99899899).

The spelling of 66609233 in words is "sixty-six million, six hundred nine thousand, two hundred thirty-three".