663323365 has 4 divisors (see below), whose sum is σ = 795988044. Its totient is φ = 530658688.

The previous prime is 663323363. The next prime is 663323369. The reversal of 663323365 is 563323366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 563323366 = 2 ⋅281661683.

It can be written as a sum of positive squares in 2 ways, for example, as 129436129 + 533887236 = 11377^2 + 23106^2 .

It is a cyclic number.

It is not a de Polignac number, because 663323365 - 2¹ = 663323363 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 (663323363) 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, 66332332 + ... + 66332341.

It is an arithmetic number, because the mean of its divisors is an integer number (198997011).

Almost surely, 2^663323365 is an apocalyptic number.

It is an amenable number.

663323365 is a deficient number, since it is larger than the sum of its proper divisors (132664679).

663323365 is a wasteful number, since it uses less digits than its factorization.

663323365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132664678.

The product of its digits is 174960, while the sum is 37.

The square root of 663323365 is about 25755.0648416967. The cubic root of 663323365 is about 872.1176952527.

Subtracting from 663323365 its reverse (563323366), we obtain a palindrome (99999999).

The spelling of 663323365 in words is "six hundred sixty-three million, three hundred twenty-three thousand, three hundred sixty-five".