663823 has 2 divisors, whose sum is σ = 663824. Its totient is φ = 663822.

The previous prime is 663821. The next prime is 663827. The reversal of 663823 is 328366.

It is a weak prime.

663823 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 663823 - 2¹ = 663821 is a prime.

Together with 663821, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 663791 and 663800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331911 + 331912.

It is an arithmetic number, because the mean of its divisors is an integer number (331912).

2⁶⁶³⁸²³ is an apocalyptic number.

663823 is a deficient number, since it is larger than the sum of its proper divisors (1).

663823 is an equidigital number, since it uses as much as digits as its factorization.

663823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 28.

The square root of 663823 is about 814.7533369063. The cubic root of 663823 is about 87.2336608676.

The spelling of 663823 in words is "six hundred sixty-three thousand, eight hundred twenty-three".