663605473 has 4 divisors (see below), whose sum is σ = 663683328. Its totient is φ = 663527620.

The previous prime is 663605461. The next prime is 663605491. The reversal of 663605473 is 374506366.

663605473 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 663605473 - 2²⁵ = 630051041 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663605443) 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, 24313 + ... + 43798.

It is an arithmetic number, because the mean of its divisors is an integer number (165920832).

Almost surely, 2^663605473 is an apocalyptic number.

It is an amenable number.

663605473 is a deficient number, since it is larger than the sum of its proper divisors (77855).

663605473 is an equidigital number, since it uses as much as digits as its factorization.

663605473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77854.

The product of its (nonzero) digits is 272160, while the sum is 40.

The square root of 663605473 is about 25760.5410075177. The cubic root of 663605473 is about 872.2413134463.

The spelling of 663605473 in words is "six hundred sixty-three million, six hundred five thousand, four hundred seventy-three".