663388243 has 4 divisors (see below), whose sum is σ = 758158000. Its totient is φ = 568618488.

The previous prime is 663388199. The next prime is 663388247. The reversal of 663388243 is 342883366.

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 663388243 - 2¹⁷ = 663257171 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 663388243.

It is not an unprimeable number, because it can be changed into a prime (663388247) 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, 47384868 + ... + 47384881.

It is an arithmetic number, because the mean of its divisors is an integer number (189539500).

Almost surely, 2^663388243 is an apocalyptic number.

663388243 is a deficient number, since it is larger than the sum of its proper divisors (94769757).

663388243 is an equidigital number, since it uses as much as digits as its factorization.

663388243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94769756.

The product of its digits is 497664, while the sum is 43.

The square root of 663388243 is about 25756.3243301524. The cubic root of 663388243 is about 872.1461275429.

The spelling of 663388243 in words is "six hundred sixty-three million, three hundred eighty-eight thousand, two hundred forty-three".