6688940671378 has 16 divisors (see below), whose sum is σ = 11469544821504. Its totient is φ = 2865991512960.

The previous prime is 6688940671367. The next prime is 6688940671417. The reversal of 6688940671378 is 8731760498866.

It is a self number, because there is not a number n which added to its sum of digits gives 6688940671378.

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, 58052575 + ... + 58167682.

It is an arithmetic number, because the mean of its divisors is an integer number (716846551344).

Almost surely, 2^{6688940671378} is an apocalyptic number.

6688940671378 is a deficient number, since it is larger than the sum of its proper divisors (4780604150126).

6688940671378 is a wasteful number, since it uses less digits than its factorization.

6688940671378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116224377.

The product of its (nonzero) digits is 585252864, while the sum is 73.

The spelling of 6688940671378 in words is "six trillion, six hundred eighty-eight billion, nine hundred forty million, six hundred seventy-one thousand, three hundred seventy-eight".