66384536240 has 160 divisors (see below), whose sum is σ = 187663703040. Its totient is φ = 21523968000.

The previous prime is 66384536203. The next prime is 66384536263. The reversal of 66384536240 is 4263548366.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167465 + ... + 401015.

It is an arithmetic number, because the mean of its divisors is an integer number (1172898144).

Almost surely, 2^66384536240 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 66384536240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93831851520).

66384536240 is an abundant number, since it is smaller than the sum of its proper divisors (121279166800).

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

66384536240 is a wasteful number, since it uses less digits than its factorization.

66384536240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233611 (or 233605 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 47.

The spelling of 66384536240 in words is "sixty-six billion, three hundred eighty-four million, five hundred thirty-six thousand, two hundred forty".