664800163884 has 96 divisors (see below), whose sum is σ = 1737342432000. Its totient is φ = 219833463168.

The previous prime is 664800163831. The next prime is 664800163897. The reversal of 664800163884 is 488361008466.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 664800163884.

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, 8059072 + ... + 8141144.

It is an arithmetic number, because the mean of its divisors is an integer number (18097317000).

Almost surely, 2^664800163884 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664800163884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (868671216000).

664800163884 is an abundant number, since it is smaller than the sum of its proper divisors (1072542268116).

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

664800163884 is a wasteful number, since it uses less digits than its factorization.

664800163884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82684 (or 82676 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 54.

The spelling of 664800163884 in words is "six hundred sixty-four billion, eight hundred million, one hundred sixty-three thousand, eight hundred eighty-four".