66706223 has 2 divisors, whose sum is σ = 66706224. Its totient is φ = 66706222.

The previous prime is 66706219. The next prime is 66706229. The reversal of 66706223 is 32260766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66706223 - 2² = 66706219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66706223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66706229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33353111 + 33353112.

It is an arithmetic number, because the mean of its divisors is an integer number (33353112).

Almost surely, 2^66706223 is an apocalyptic number.

66706223 is a deficient number, since it is larger than the sum of its proper divisors (1).

66706223 is an equidigital number, since it uses as much as digits as its factorization.

66706223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 66706223 is about 8167.3877708849. The cubic root of 66706223 is about 405.5603137186.

Adding to 66706223 its reverse (32260766), we get a palindrome (98966989).

The spelling of 66706223 in words is "sixty-six million, seven hundred six thousand, two hundred twenty-three".