664065134656 has 224 divisors, whose sum is σ = 1659990933504. Its totient is φ = 256048128000.

The previous prime is 664065134597. The next prime is 664065134669. The reversal of 664065134656 is 656431560466.

It is a tau number, because it is divible by the number of its divisors (224).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 307294216 + ... + 307296376.

Almost surely, 2^664065134656 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 664065134656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (829995466752).

664065134656 is an abundant number, since it is smaller than the sum of its proper divisors (995925798848).

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

664065134656 is a wasteful number, since it uses less digits than its factorization.

664065134656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2809 (or 2799 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 52.

The spelling of 664065134656 in words is "six hundred sixty-four billion, sixty-five million, one hundred thirty-four thousand, six hundred fifty-six".