663653 has 2 divisors, whose sum is σ = 663654. Its totient is φ = 663652.

The previous prime is 663631. The next prime is 663659. The reversal of 663653 is 356366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 643204 + 20449 = 802^2 + 143^2 .

It is a cyclic number.

It is not a de Polignac number, because 663653 - 2⁶ = 663589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331826 + 331827.

It is an arithmetic number, because the mean of its divisors is an integer number (331827).

2⁶⁶³⁶⁵³ is an apocalyptic number.

It is an amenable number.

663653 is a deficient number, since it is larger than the sum of its proper divisors (1).

663653 is an equidigital number, since it uses as much as digits as its factorization.

663653 is an odious number, because the sum of its binary digits is odd.

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

The square root of 663653 is about 814.6490041730. The cubic root of 663653 is about 87.2262136071.

The spelling of 663653 in words is "six hundred sixty-three thousand, six hundred fifty-three".