663564913 has 4 divisors (see below), whose sum is σ = 723889008. Its totient is φ = 603240820.

The previous prime is 663564899. The next prime is 663564931. The reversal of 663564913 is 319465366.

663564913 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 663564913 - 2²⁵ = 630010481 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 663564913.

It is not an unprimeable number, because it can be changed into a prime (663564943) 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, 30162031 + ... + 30162052.

It is an arithmetic number, because the mean of its divisors is an integer number (180972252).

Almost surely, 2^663564913 is an apocalyptic number.

It is an amenable number.

663564913 is a deficient number, since it is larger than the sum of its proper divisors (60324095).

663564913 is a wasteful number, since it uses less digits than its factorization.

663564913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60324094.

The product of its digits is 349920, while the sum is 43.

The square root of 663564913 is about 25759.7537449410. The cubic root of 663564913 is about 872.2235424312.

The spelling of 663564913 in words is "six hundred sixty-three million, five hundred sixty-four thousand, nine hundred thirteen".