818663 has 4 divisors (see below), whose sum is σ = 823368. Its totient is φ = 813960.

The previous prime is 818659. The next prime is 818683. The reversal of 818663 is 366818.

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

It is a cyclic number.

It is not a de Polignac number, because 818663 - 2² = 818659 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 (818603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2081 + ... + 2442.

It is an arithmetic number, because the mean of its divisors is an integer number (205842).

2⁸¹⁸⁶⁶³ is an apocalyptic number.

818663 is a deficient number, since it is larger than the sum of its proper divisors (4705).

818663 is a wasteful number, since it uses less digits than its factorization.

818663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4704.

The product of its digits is 6912, while the sum is 32.

The square root of 818663 is about 904.7999778957. The cubic root of 818663 is about 93.5481178735.

The spelling of 818663 in words is "eight hundred eighteen thousand, six hundred sixty-three".