663893 has 2 divisors, whose sum is σ = 663894. Its totient is φ = 663892.

The previous prime is 663881. The next prime is 663907. The reversal of 663893 is 398366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 485809 + 178084 = 697^2 + 422^2 .

It is a cyclic number.

It is not a de Polignac number, because 663893 - 2¹⁴ = 647509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331946 + 331947.

It is an arithmetic number, because the mean of its divisors is an integer number (331947).

2⁶⁶³⁸⁹³ is an apocalyptic number.

It is an amenable number.

663893 is a deficient number, since it is larger than the sum of its proper divisors (1).

663893 is an equidigital number, since it uses as much as digits as its factorization.

663893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 35.

The square root of 663893 is about 814.7962935605. The cubic root of 663893 is about 87.2367270171.

The spelling of 663893 in words is "six hundred sixty-three thousand, eight hundred ninety-three".