663853 has 2 divisors, whose sum is σ = 663854. Its totient is φ = 663852.

The previous prime is 663827. The next prime is 663857. The reversal of 663853 is 358366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 644809 + 19044 = 803^2 + 138^2 .

663853 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 663853 - 2⁵ = 663821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331926 + 331927.

It is an arithmetic number, because the mean of its divisors is an integer number (331927).

2⁶⁶³⁸⁵³ is an apocalyptic number.

It is an amenable number.

663853 is a deficient number, since it is larger than the sum of its proper divisors (1).

663853 is an equidigital number, since it uses as much as digits as its factorization.

663853 is an evil number, because the sum of its binary digits is even.

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

The square root of 663853 is about 814.7717471783. The cubic root of 663853 is about 87.2349749581.

The spelling of 663853 in words is "six hundred sixty-three thousand, eight hundred fifty-three".