663723823 has 16 divisors (see below), whose sum is σ = 780549696. Its totient is φ = 552614400.

The previous prime is 663723803. The next prime is 663723829. The reversal of 663723823 is 328327366.

It is a cyclic number.

It is not a de Polignac number, because 663723823 - 2¹⁷ = 663592751 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 (663723829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28615 + ... + 46327.

It is an arithmetic number, because the mean of its divisors is an integer number (48784356).

Almost surely, 2^663723823 is an apocalyptic number.

663723823 is a deficient number, since it is larger than the sum of its proper divisors (116825873).

663723823 is a wasteful number, since it uses less digits than its factorization.

663723823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17874.

The product of its digits is 217728, while the sum is 40.

The square root of 663723823 is about 25762.8380230129. The cubic root of 663723823 is about 872.2931633417.

The spelling of 663723823 in words is "six hundred sixty-three million, seven hundred twenty-three thousand, eight hundred twenty-three".