663245633 has 8 divisors (see below), whose sum is σ = 707388552. Its totient is φ = 619672576.

The previous prime is 663245587. The next prime is 663245659. The reversal of 663245633 is 336542366.

It can be written as a sum of positive squares in 4 ways, for example, as 332442289 + 330803344 = 18233^2 + 18188^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 663245633 - 2⁸ = 663245377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (663247633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140060 + ... + 144717.

It is an arithmetic number, because the mean of its divisors is an integer number (88423569).

Almost surely, 2^663245633 is an apocalyptic number.

It is an amenable number.

663245633 is a deficient number, since it is larger than the sum of its proper divisors (44142919).

663245633 is a wasteful number, since it uses less digits than its factorization.

663245633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284931.

The product of its digits is 233280, while the sum is 38.

The square root of 663245633 is about 25753.5557350825. Note that the first 3 decimals coincide. The cubic root of 663245633 is about 872.0836273533.

Adding to 663245633 its reverse (336542366), we get a palindrome (999787999).

The spelling of 663245633 in words is "six hundred sixty-three million, two hundred forty-five thousand, six hundred thirty-three".