67681818678 has 16 divisors (see below), whose sum is σ = 137077102080. Its totient is φ = 22275028776.

The previous prime is 67681818661. The next prime is 67681818679. The reversal of 67681818678 is 87681818676.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67681818679) 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 7 ways as a sum of consecutive naturals, for example, 71393850 + ... + 71394797.

It is an arithmetic number, because the mean of its divisors is an integer number (8567318880).

Almost surely, 2^67681818678 is an apocalyptic number.

67681818678 is an abundant number, since it is smaller than the sum of its proper divisors (69395283402).

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

67681818678 is a wasteful number, since it uses less digits than its factorization.

67681818678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142788731.

The product of its digits is 43352064, while the sum is 66.

The spelling of 67681818678 in words is "sixty-seven billion, six hundred eighty-one million, eight hundred eighteen thousand, six hundred seventy-eight".