66680233 has 2 divisors, whose sum is σ = 66680234. Its totient is φ = 66680232.

The previous prime is 66680213. The next prime is 66680267. The reversal of 66680233 is 33208666.

It is an a-pointer prime, because the next prime (66680267) can be obtained adding 66680233 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34904464 + 31775769 = 5908^2 + 5637^2 .

It is a cyclic number.

It is not a de Polignac number, because 66680233 - 2²¹ = 64583081 is a prime.

It is not a weakly prime, because it can be changed into another prime (66680213) 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, 33340116 + 33340117.

It is an arithmetic number, because the mean of its divisors is an integer number (33340117).

Almost surely, 2^66680233 is an apocalyptic number.

It is an amenable number.

66680233 is a deficient number, since it is larger than the sum of its proper divisors (1).

66680233 is an equidigital number, since it uses as much as digits as its factorization.

66680233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 66680233 is about 8165.7965318761. The cubic root of 66680233 is about 405.5076355660.

Adding to 66680233 its reverse (33208666), we get a palindrome (99888899).

The spelling of 66680233 in words is "sixty-six million, six hundred eighty thousand, two hundred thirty-three".