663689605 has 16 divisors (see below), whose sum is σ = 855869760. Its totient is φ = 492256512.

The previous prime is 663689597. The next prime is 663689629. The reversal of 663689605 is 506986366.

663689605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 663689605 - 2³ = 663689597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52575 + ... + 63964.

It is an arithmetic number, because the mean of its divisors is an integer number (53491860).

Almost surely, 2^663689605 is an apocalyptic number.

It is an amenable number.

663689605 is a deficient number, since it is larger than the sum of its proper divisors (192180155).

663689605 is a wasteful number, since it uses less digits than its factorization.

663689605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116628.

The product of its (nonzero) digits is 1399680, while the sum is 49.

The square root of 663689605 is about 25762.1739183633. The cubic root of 663689605 is about 872.2781728495.

The spelling of 663689605 in words is "six hundred sixty-three million, six hundred eighty-nine thousand, six hundred five".