668533 has 2 divisors, whose sum is σ = 668534. Its totient is φ = 668532.

The previous prime is 668531. The next prime is 668539. The reversal of 668533 is 335866.

668533 is nontrivially palindromic in base 15.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 459684 + 208849 = 678^2 + 457^2 .

It is a cyclic number.

It is not a de Polignac number, because 668533 - 2¹ = 668531 is a prime.

Together with 668531, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 668495 and 668504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334266 + 334267.

It is an arithmetic number, because the mean of its divisors is an integer number (334267).

2⁶⁶⁸⁵³³ is an apocalyptic number.

It is an amenable number.

668533 is a deficient number, since it is larger than the sum of its proper divisors (1).

668533 is an equidigital number, since it uses as much as digits as its factorization.

668533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 31.

The square root of 668533 is about 817.6386732537. The cubic root of 668533 is about 87.4394901374.

The spelling of 668533 in words is "six hundred sixty-eight thousand, five hundred thirty-three".