66653 has 2 divisors, whose sum is σ = 66654. Its totient is φ = 66652.

The previous prime is 66643. The next prime is 66683. The reversal of 66653 is 35666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34969 + 31684 = 187^2 + 178^2 .

66653 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 66653 - 2¹⁰ = 65629 is a prime.

It is a Chen prime.

It is a plaindrome in base 9.

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 (66643) 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, 33326 + 33327.

It is an arithmetic number, because the mean of its divisors is an integer number (33327).

2⁶⁶⁶⁵³ is an apocalyptic number.

It is an amenable number.

66653 is a deficient number, since it is larger than the sum of its proper divisors (1).

66653 is an equidigital number, since it uses as much as digits as its factorization.

66653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 26.

The square root of 66653 is about 258.1724230045. The cubic root of 66653 is about 40.5452423336.

The spelling of 66653 in words is "sixty-six thousand, six hundred fifty-three".