667668106778 has 8 divisors (see below), whose sum is σ = 1001558926560. Its totient is φ = 333815131260.

The previous prime is 667668106771. The next prime is 667668106793. The reversal of 667668106778 is 877601866766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (667668106771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9416918 + ... + 9487553.

It is an arithmetic number, because the mean of its divisors is an integer number (125194865820).

Almost surely, 2^667668106778 is an apocalyptic number.

667668106778 is a deficient number, since it is larger than the sum of its proper divisors (333890819782).

667668106778 is a wasteful number, since it uses less digits than its factorization.

667668106778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18922132.

The product of its (nonzero) digits is 170698752, while the sum is 68.

The spelling of 667668106778 in words is "six hundred sixty-seven billion, six hundred sixty-eight million, one hundred six thousand, seven hundred seventy-eight".