663605673 has 8 divisors (see below), whose sum is σ = 884937408. Its totient is φ = 442338864.

The previous prime is 663605651. The next prime is 663605687. The reversal of 663605673 is 376506366.

It is a happy number.

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

It is not a de Polignac number, because 663605673 - 2⁸ = 663605417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (663609673) 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, 17836 + ... + 40562.

It is an arithmetic number, because the mean of its divisors is an integer number (110617176).

Almost surely, 2^663605673 is an apocalyptic number.

It is an amenable number.

663605673 is a deficient number, since it is larger than the sum of its proper divisors (221331735).

663605673 is a wasteful number, since it uses less digits than its factorization.

663605673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32463.

The product of its (nonzero) digits is 408240, while the sum is 42.

The square root of 663605673 is about 25760.5448894234. The cubic root of 663605673 is about 872.2414010727.

The spelling of 663605673 in words is "six hundred sixty-three million, six hundred five thousand, six hundred seventy-three".