66840384016 has 40 divisors (see below), whose sum is σ = 148553974080. Its totient is φ = 28539375744.

The previous prime is 66840383971. The next prime is 66840384043. The reversal of 66840384016 is 61048304866.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1079146 + ... + 1139401.

It is an arithmetic number, because the mean of its divisors is an integer number (3713849352).

Almost surely, 2^66840384016 is an apocalyptic number.

It is an amenable number.

66840384016 is an abundant number, since it is smaller than the sum of its proper divisors (81713590064).

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

66840384016 is a wasteful number, since it uses less digits than its factorization.

66840384016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2218831 (or 2218825 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 46.

The spelling of 66840384016 in words is "sixty-six billion, eight hundred forty million, three hundred eighty-four thousand, sixteen".