668633 has 8 divisors (see below), whose sum is σ = 797568. Its totient is φ = 548064.

The previous prime is 668623. The next prime is 668671. The reversal of 668633 is 336866.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668633 - 2⁴ = 668617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 668633.

It is not an unprimeable number, because it can be changed into a prime (668623) 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 in 7 ways as a sum of consecutive naturals, for example, 1916 + ... + 2237.

It is an arithmetic number, because the mean of its divisors is an integer number (99696).

2⁶⁶⁸⁶³³ is an apocalyptic number.

It is an amenable number.

668633 is a deficient number, since it is larger than the sum of its proper divisors (128935).

668633 is a wasteful number, since it uses less digits than its factorization.

668633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4183.

The product of its digits is 15552, while the sum is 32.

The square root of 668633 is about 817.6998226733. The cubic root of 668633 is about 87.4438496893.

It can be divided in two parts, 66863 and 3, that added together give a palindrome (66866).

The spelling of 668633 in words is "six hundred sixty-eight thousand, six hundred thirty-three".