66605311 has 2 divisors, whose sum is σ = 66605312. Its totient is φ = 66605310.

The previous prime is 66605299. The next prime is 66605327. The reversal of 66605311 is 11350666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66605311 - 2¹³ = 66597119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66605311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66605911) 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, 33302655 + 33302656.

It is an arithmetic number, because the mean of its divisors is an integer number (33302656).

Almost surely, 2^66605311 is an apocalyptic number.

66605311 is a deficient number, since it is larger than the sum of its proper divisors (1).

66605311 is an equidigital number, since it uses as much as digits as its factorization.

66605311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 66605311 is about 8161.2076924926. The cubic root of 66605311 is about 405.3557023384.

Adding to 66605311 its reverse (11350666), we get a palindrome (77955977).

The spelling of 66605311 in words is "sixty-six million, six hundred five thousand, three hundred eleven".