663441805560 has 128 divisors (see below), whose sum is σ = 2068717708800. Its totient is φ = 170007452160.

The previous prime is 663441805541. The next prime is 663441805583. The reversal of 663441805560 is 65508144366.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 282517 + ... + 1186043.

It is an arithmetic number, because the mean of its divisors is an integer number (16161857100).

Almost surely, 2^663441805560 is an apocalyptic number.

663441805560 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 663441805560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1034358854400).

663441805560 is an abundant number, since it is smaller than the sum of its proper divisors (1405275903240).

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

663441805560 is a wasteful number, since it uses less digits than its factorization.

663441805560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903781 (or 903777 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 48.

The spelling of 663441805560 in words is "six hundred sixty-three billion, four hundred forty-one million, eight hundred five thousand, five hundred sixty".