6640181780064 has 48 divisors (see below), whose sum is σ = 19920545342208. Its totient is φ = 1897194794112.

The previous prime is 6640181780027. The next prime is 6640181780117. The reversal of 6640181780064 is 4600871810466.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 6640181779989 and 6640181780016.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4940610772 + ... + 4940612115.

It is an arithmetic number, because the mean of its divisors is an integer number (415011361296).

Almost surely, 2^{6640181780064} is an apocalyptic number.

It is an amenable number.

6640181780064 is an abundant number, since it is smaller than the sum of its proper divisors (13280363562144).

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

6640181780064 is a wasteful number, since it uses less digits than its factorization.

6640181780064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9881222907 (or 9881222899 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 51.

The spelling of 6640181780064 in words is "six trillion, six hundred forty billion, one hundred eighty-one million, seven hundred eighty thousand, sixty-four".