68307868666 has 4 divisors (see below), whose sum is σ = 102461803002. Its totient is φ = 34153934332.

The previous prime is 68307868619. The next prime is 68307868679. The reversal of 68307868666 is 66686870386.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66686870386 = 2 ⋅33343435193.

It can be written as a sum of positive squares in only one way, i.e., 41893493041 + 26414375625 = 204679^2 + 162525^2 .

It is a junction number, because it is equal to n+sod(n) for n = 68307868598 and 68307868607.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17076967165 + ... + 17076967168.

Almost surely, 2^68307868666 is an apocalyptic number.

68307868666 is a deficient number, since it is larger than the sum of its proper divisors (34153934336).

68307868666 is a wasteful number, since it uses less digits than its factorization.

68307868666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34153934335.

The product of its (nonzero) digits is 83607552, while the sum is 64.

The spelling of 68307868666 in words is "sixty-eight billion, three hundred seven million, eight hundred sixty-eight thousand, six hundred sixty-six".