664064646202720 has 192 divisors, whose sum is σ = 1806152663379456. Its totient is φ = 226006062428160.

The previous prime is 664064646202709. The next prime is 664064646202721. The reversal of 664064646202720 is 27202646460466.

It is a super-2 number, since 2×664064646202720² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664064646202721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3401820639 + ... + 3402015841.

It is an arithmetic number, because the mean of its divisors is an integer number (9407045121768).

Almost surely, 2^{664064646202720} 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 664064646202720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (903076331689728).

664064646202720 is an abundant number, since it is smaller than the sum of its proper divisors (1142088017176736).

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

664064646202720 is a wasteful number, since it uses less digits than its factorization.

664064646202720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217533 (or 217525 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 55.

The spelling of 664064646202720 in words is "six hundred sixty-four trillion, sixty-four billion, six hundred forty-six million, two hundred two thousand, seven hundred twenty".