66384515402240 has 320 divisors, whose sum is σ = 188548687540224. Its totient is φ = 21943642963968.

The previous prime is 66384515402207. The next prime is 66384515402321. The reversal of 66384515402240 is 4220451548366.

It is a tau number, because it is divible by the number of its divisors (320).

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, 55841879 + ... + 57018281.

Almost surely, 2^{66384515402240} 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 66384515402240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94274343770112).

66384515402240 is an abundant number, since it is smaller than the sum of its proper divisors (122164172137984).

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

66384515402240 is a wasteful number, since it uses less digits than its factorization.

66384515402240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176547 (or 1176531 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 50.

The spelling of 66384515402240 in words is "sixty-six trillion, three hundred eighty-four billion, five hundred fifteen million, four hundred two thousand, two hundred forty".