68744668666 has 8 divisors (see below), whose sum is σ = 105903949140. Its totient is φ = 33443352288.

The previous prime is 68744668661. The next prime is 68744668679. The reversal of 68744668666 is 66686644786.

It can be written as a sum of positive squares in 2 ways, for example, as 68709515625 + 35153041 = 262125^2 + 5929^2 .

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 (68744668661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464490931 + ... + 464491078.

Almost surely, 2^68744668666 is an apocalyptic number.

68744668666 is a deficient number, since it is larger than the sum of its proper divisors (37159280474).

68744668666 is a wasteful number, since it uses less digits than its factorization.

68744668666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928982048.

The product of its digits is 334430208, while the sum is 67.

The spelling of 68744668666 in words is "sixty-eight billion, seven hundred forty-four million, six hundred sixty-eight thousand, six hundred sixty-six".