66449 has 2 divisors, whose sum is σ = 66450. Its totient is φ = 66448.

The previous prime is 66431. The next prime is 66457. The reversal of 66449 is 94466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66049 + 400 = 257^2 + 20^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66449 is a prime.

It is not a weakly prime, because it can be changed into another prime (66499) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33224 + 33225.

It is an arithmetic number, because the mean of its divisors is an integer number (33225).

2⁶⁶⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

66449 is a deficient number, since it is larger than the sum of its proper divisors (1).

66449 is an equidigital number, since it uses as much as digits as its factorization.

66449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 29.

The square root of 66449 is about 257.7770354395. Note that the first 3 decimals coincide. The cubic root of 66449 is about 40.5038354342.

It can be divided in two parts, 66 and 449, that added together give a palindrome (515).

The spelling of 66449 in words is "sixty-six thousand, four hundred forty-nine".