663366384840 has 128 divisors (see below), whose sum is σ = 2057276805120. Its totient is φ = 170942918400.

The previous prime is 663366384743. The next prime is 663366384869. The reversal of 663366384840 is 48483663366.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2441487 + ... + 2699553.

It is an arithmetic number, because the mean of its divisors is an integer number (16072475040).

Almost surely, 2^663366384840 is an apocalyptic number.

663366384840 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 663366384840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1028638402560).

663366384840 is an abundant number, since it is smaller than the sum of its proper divisors (1393910420280).

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

663366384840 is a wasteful number, since it uses less digits than its factorization.

663366384840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258803 (or 258799 counting only the distinct ones).

The product of its (nonzero) digits is 35831808, while the sum is 57.

The spelling of 663366384840 in words is "six hundred sixty-three billion, three hundred sixty-six million, three hundred eighty-four thousand, eight hundred forty".