66499 has 2 divisors, whose sum is σ = 66500. Its totient is φ = 66498.

The previous prime is 66491. The next prime is 66509. The reversal of 66499 is 99466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66499 - 2³ = 66491 is a prime.

It is not a weakly prime, because it can be changed into another prime (66491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33249 + 33250.

It is an arithmetic number, because the mean of its divisors is an integer number (33250).

2⁶⁶⁴⁹⁹ is an apocalyptic number.

66499 is a deficient number, since it is larger than the sum of its proper divisors (1).

66499 is an equidigital number, since it uses as much as digits as its factorization.

66499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 34.

The square root of 66499 is about 257.8740002404. The cubic root of 66499 is about 40.5139920155.

It can be divided in two parts, 66 and 499, that added together give a palindrome (565).

The spelling of 66499 in words is "sixty-six thousand, four hundred ninety-nine".