66381703860 has 48 divisors (see below), whose sum is σ = 185905181952. Its totient is φ = 17698320000.

The previous prime is 66381703847. The next prime is 66381703867. The reversal of 66381703860 is 6830718366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66381703867) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 208110 + ... + 419610.

It is an arithmetic number, because the mean of its divisors is an integer number (3873024624).

Almost surely, 2^66381703860 is an apocalyptic number.

66381703860 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66381703860 is an abundant number, since it is smaller than the sum of its proper divisors (119523478092).

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

66381703860 is a wasteful number, since it uses less digits than its factorization.

66381703860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216744 (or 216742 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 48.

The spelling of 66381703860 in words is "sixty-six billion, three hundred eighty-one million, seven hundred three thousand, eight hundred sixty".