664994468320 has 576 divisors, whose sum is σ = 2016811089216. Its totient is φ = 205302988800.

The previous prime is 664994468227. The next prime is 664994468323. The reversal of 664994468320 is 23864499466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664994468323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1658340120 + ... + 1658340520.

It is an arithmetic number, because the mean of its divisors is an integer number (3501408141).

Almost surely, 2^664994468320 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 664994468320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1008405544608).

664994468320 is an abundant number, since it is smaller than the sum of its proper divisors (1351816620896).

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

664994468320 is a wasteful number, since it uses less digits than its factorization.

664994468320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803 (or 788 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 61.

The spelling of 664994468320 in words is "six hundred sixty-four billion, nine hundred ninety-four million, four hundred sixty-eight thousand, three hundred twenty".