663844560 has 160 divisors (see below), whose sum is σ = 2190395520. Its totient is φ = 166316032.

The previous prime is 663844529. The next prime is 663844567. The reversal of 663844560 is 65448366.

663844560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663844567) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1178839 + ... + 1179401.

It is an arithmetic number, because the mean of its divisors is an integer number (13689972).

Almost surely, 2^663844560 is an apocalyptic number.

663844560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663844560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1095197760).

663844560 is an abundant number, since it is smaller than the sum of its proper divisors (1526550960).

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

663844560 is a wasteful number, since it uses less digits than its factorization.

663844560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630 (or 590 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The square root of 663844560 is about 25765.1811559709. The cubic root of 663844560 is about 872.3460526463.

The spelling of 663844560 in words is "six hundred sixty-three million, eight hundred forty-four thousand, five hundred sixty".