66638982384 has 120 divisors (see below), whose sum is σ = 201585139392. Its totient is φ = 20428485120.

The previous prime is 66638982341. The next prime is 66638982437. The reversal of 66638982384 is 48328983666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 441634 + ... + 572990.

Almost surely, 2^66638982384 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 66638982384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100792569696).

66638982384 is an abundant number, since it is smaller than the sum of its proper divisors (134946157008).

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

66638982384 is a wasteful number, since it uses less digits than its factorization.

66638982384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131655 (or 131646 counting only the distinct ones).

The product of its digits is 71663616, while the sum is 63.

The spelling of 66638982384 in words is "sixty-six billion, six hundred thirty-eight million, nine hundred eighty-two thousand, three hundred eighty-four".