66239788032 has 264 divisors, whose sum is σ = 217733330880. Its totient is φ = 19199262720.

The previous prime is 66239788001. The next prime is 66239788037. The reversal of 66239788032 is 23088793266.

It is a happy number.

66239788032 is a `hidden beast` number, since 6 + 623 + 9 + 7 + 8 + 8 + 0 + 3 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (264).

It is a self number, because there is not a number n which added to its sum of digits gives 66239788032.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66239788037) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2317444 + ... + 2345852.

Almost surely, 2^66239788032 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 66239788032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108866665440).

66239788032 is an abundant number, since it is smaller than the sum of its proper divisors (151493542848).

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

66239788032 is a wasteful number, since it uses less digits than its factorization.

66239788032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28469 (or 28448 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 54.

The spelling of 66239788032 in words is "sixty-six billion, two hundred thirty-nine million, seven hundred eighty-eight thousand, thirty-two".