66357566688 has 96 divisors (see below), whose sum is σ = 199247682816. Its totient is φ = 18942640128.

The previous prime is 66357566683. The next prime is 66357566689. The reversal of 66357566688 is 88666575366.

66357566688 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66357566683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 731995 + ... + 817637.

It is an arithmetic number, because the mean of its divisors is an integer number (2075496696).

Almost surely, 2^66357566688 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 66357566688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99623841408).

66357566688 is an abundant number, since it is smaller than the sum of its proper divisors (132890116128).

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

66357566688 is a wasteful number, since it uses less digits than its factorization.

66357566688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86816 (or 86808 counting only the distinct ones).

The product of its digits is 261273600, while the sum is 66.

The spelling of 66357566688 in words is "sixty-six billion, three hundred fifty-seven million, five hundred sixty-six thousand, six hundred eighty-eight".