66665233 has 2 divisors, whose sum is σ = 66665234. Its totient is φ = 66665232.

The previous prime is 66665227. The next prime is 66665251. The reversal of 66665233 is 33256666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52316289 + 14348944 = 7233^2 + 3788^2 .

It is a cyclic number.

It is not a de Polignac number, because 66665233 - 2¹⁷ = 66534161 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66665192 and 66665201.

It is not a weakly prime, because it can be changed into another prime (66665213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33332616 + 33332617.

It is an arithmetic number, because the mean of its divisors is an integer number (33332617).

Almost surely, 2^66665233 is an apocalyptic number.

It is an amenable number.

66665233 is a deficient number, since it is larger than the sum of its proper divisors (1).

66665233 is an equidigital number, since it uses as much as digits as its factorization.

66665233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 37.

The square root of 66665233 is about 8164.8780150104. The cubic root of 66665233 is about 405.4772264006.

The spelling of 66665233 in words is "sixty-six million, six hundred sixty-five thousand, two hundred thirty-three".