66665311 has 2 divisors, whose sum is σ = 66665312. Its totient is φ = 66665310.

The previous prime is 66665273. The next prime is 66665321. The reversal of 66665311 is 11356666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66665311 - 2¹⁵ = 66632543 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66665321) 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, 33332655 + 33332656.

It is an arithmetic number, because the mean of its divisors is an integer number (33332656).

Almost surely, 2^66665311 is an apocalyptic number.

66665311 is a deficient number, since it is larger than the sum of its proper divisors (1).

66665311 is an equidigital number, since it uses as much as digits as its factorization.

66665311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 34.

The square root of 66665311 is about 8164.8827915654. The cubic root of 66665311 is about 405.4773845401.

The spelling of 66665311 in words is "sixty-six million, six hundred sixty-five thousand, three hundred eleven".