664568550000 has 720 divisors, whose sum is σ = 2443534853760. Its totient is φ = 174817440000.

The previous prime is 664568549941. The next prime is 664568550029. The reversal of 664568550000 is 55865466.

It is a happy number.

664568550000 is a `hidden beast` number, since 6 + 64 + 5 + 6 + 85 + 500 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1008449671 + ... + 1008450329.

It is an arithmetic number, because the mean of its divisors is an integer number (3393798408).

Almost surely, 2^664568550000 is an apocalyptic number.

664568550000 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 664568550000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1221767426880).

664568550000 is an abundant number, since it is smaller than the sum of its proper divisors (1778966303760).

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

664568550000 is an frugal number, since it uses more digits than its factorization.

664568550000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790 (or 752 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The spelling of 664568550000 in words is "six hundred sixty-four billion, five hundred sixty-eight million, five hundred fifty thousand".