68561650667 has 2 divisors, whose sum is σ = 68561650668. Its totient is φ = 68561650666.

The previous prime is 68561650643. The next prime is 68561650693. The reversal of 68561650667 is 76605616586.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68561650667 is a prime.

It is not a weakly prime, because it can be changed into another prime (68561650637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34280825333 + 34280825334.

It is an arithmetic number, because the mean of its divisors is an integer number (34280825334).

Almost surely, 2^68561650667 is an apocalyptic number.

68561650667 is a deficient number, since it is larger than the sum of its proper divisors (1).

68561650667 is an equidigital number, since it uses as much as digits as its factorization.

68561650667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10886400, while the sum is 56.

The spelling of 68561650667 in words is "sixty-eight billion, five hundred sixty-one million, six hundred fifty thousand, six hundred sixty-seven".