805663 has 4 divisors (see below), whose sum is σ = 809248. Its totient is φ = 802080.

The previous prime is 805639. The next prime is 805687. The reversal of 805663 is 366508.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (805639) and next prime (805687).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-805663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1431 + ... + 1912.

It is an arithmetic number, because the mean of its divisors is an integer number (202312).

2⁸⁰⁵⁶⁶³ is an apocalyptic number.

805663 is a deficient number, since it is larger than the sum of its proper divisors (3585).

805663 is a wasteful number, since it uses less digits than its factorization.

805663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3584.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 805663 is about 897.5873216573. The cubic root of 805663 is about 93.0503061550.

It can be divided in two parts, 8056 and 63, that multiplied together give a triangular number (507528 = T₁₀₀₇).

The spelling of 805663 in words is "eight hundred five thousand, six hundred sixty-three".