663511613 has 4 divisors (see below), whose sum is σ = 692359968. Its totient is φ = 634663260.

The previous prime is 663511603. The next prime is 663511621. The reversal of 663511613 is 316115366.

663511613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 663511613 - 2²⁴ = 646734397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 663511613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663511603) 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, 14424143 + ... + 14424188.

It is an arithmetic number, because the mean of its divisors is an integer number (173089992).

Almost surely, 2^663511613 is an apocalyptic number.

It is an amenable number.

663511613 is a deficient number, since it is larger than the sum of its proper divisors (28848355).

663511613 is a wasteful number, since it uses less digits than its factorization.

663511613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28848354.

The product of its digits is 9720, while the sum is 32.

The square root of 663511613 is about 25758.7191645858. The cubic root of 663511613 is about 872.2001883937.

Adding to 663511613 its reverse (316115366), we get a palindrome (979626979).

The spelling of 663511613 in words is "six hundred sixty-three million, five hundred eleven thousand, six hundred thirteen".