663320023 has 4 divisors (see below), whose sum is σ = 692160048. Its totient is φ = 634480000.

The previous prime is 663320003. The next prime is 663320027. The reversal of 663320023 is 320023366.

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 663320023 - 2⁹ = 663319511 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 663320023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663320027) 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, 14419978 + ... + 14420023.

It is an arithmetic number, because the mean of its divisors is an integer number (173040012).

Almost surely, 2^663320023 is an apocalyptic number.

663320023 is a deficient number, since it is larger than the sum of its proper divisors (28840025).

663320023 is a wasteful number, since it uses less digits than its factorization.

663320023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28840024.

The product of its (nonzero) digits is 3888, while the sum is 25.

The square root of 663320023 is about 25754.9999611726. Note that the first 4 decimals coincide. The cubic root of 663320023 is about 872.1162305964.

Adding to 663320023 its reverse (320023366), we get a palindrome (983343389).

The spelling of 663320023 in words is "six hundred sixty-three million, three hundred twenty thousand, twenty-three".