665633 has 2 divisors, whose sum is σ = 665634. Its totient is φ = 665632.

The previous prime is 665629. The next prime is 665659. The reversal of 665633 is 336566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 652864 + 12769 = 808^2 + 113^2 .

It is a cyclic number.

It is not a de Polignac number, because 665633 - 2² = 665629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665596 and 665605.

It is not a weakly prime, because it can be changed into another prime (665603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332816 + 332817.

It is an arithmetic number, because the mean of its divisors is an integer number (332817).

2⁶⁶⁵⁶³³ is an apocalyptic number.

It is an amenable number.

665633 is a deficient number, since it is larger than the sum of its proper divisors (1).

665633 is an equidigital number, since it uses as much as digits as its factorization.

665633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 29.

The square root of 665633 is about 815.8633464006. The cubic root of 665633 is about 87.3128735684.

It can be divided in two parts, 66563 and 3, that added together give a palindrome (66566).

The spelling of 665633 in words is "six hundred sixty-five thousand, six hundred thirty-three".