68463972617 has 2 divisors, whose sum is σ = 68463972618. Its totient is φ = 68463972616.

The previous prime is 68463972613. The next prime is 68463972659. The reversal of 68463972617 is 71627936486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64140121081 + 4323851536 = 253259^2 + 65756^2 .

It is a cyclic number.

It is not a de Polignac number, because 68463972617 - 2² = 68463972613 is a prime.

It is not a weakly prime, because it can be changed into another prime (68463972613) 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 as a sum of consecutive naturals, namely, 34231986308 + 34231986309.

It is an arithmetic number, because the mean of its divisors is an integer number (34231986309).

Almost surely, 2^68463972617 is an apocalyptic number.

It is an amenable number.

68463972617 is a deficient number, since it is larger than the sum of its proper divisors (1).

68463972617 is an equidigital number, since it uses as much as digits as its factorization.

68463972617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18289152, while the sum is 59.

The spelling of 68463972617 in words is "sixty-eight billion, four hundred sixty-three million, nine hundred seventy-two thousand, six hundred seventeen".