66380378904 has 128 divisors (see below), whose sum is σ = 210907660800. Its totient is φ = 18949956480.

The previous prime is 66380378903. The next prime is 66380379001. The reversal of 66380378904 is 40987308366.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66380378903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1852599 + ... + 1888089.

It is an arithmetic number, because the mean of its divisors is an integer number (1647716100).

Almost surely, 2^66380378904 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 66380378904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105453830400).

66380378904 is an abundant number, since it is smaller than the sum of its proper divisors (144527281896).

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

66380378904 is a wasteful number, since it uses less digits than its factorization.

66380378904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36750 (or 36740 counting only the distinct ones).

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

The spelling of 66380378904 in words is "sixty-six billion, three hundred eighty million, three hundred seventy-eight thousand, nine hundred four".