663655764 has 48 divisors (see below), whose sum is σ = 1571851008. Its totient is φ = 217909248.

The previous prime is 663655753. The next prime is 663655793. The reversal of 663655764 is 467556366.

663655764 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

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, 269989 + ... + 272435.

It is an arithmetic number, because the mean of its divisors is an integer number (32746896).

Almost surely, 2^663655764 is an apocalyptic number.

It is an amenable number.

663655764 is an abundant number, since it is smaller than the sum of its proper divisors (908195244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

663655764 is a wasteful number, since it uses less digits than its factorization.

663655764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2784 (or 2782 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 48.

The square root of 663655764 is about 25761.5171137105. The cubic root of 663655764 is about 872.2633470097.

The spelling of 663655764 in words is "six hundred sixty-three million, six hundred fifty-five thousand, seven hundred sixty-four".