168640061669 has 2 divisors, whose sum is σ = 168640061670. Its totient is φ = 168640061668.

The previous prime is 168640061651. The next prime is 168640061677. The reversal of 168640061669 is 966160046861.

168640061669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158135861569 + 10504200100 = 397663^2 + 102490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168640061669 is a prime.

It is a super-2 number, since 2×168640061669² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 168640061669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168640061609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84320030834 + 84320030835.

It is an arithmetic number, because the mean of its divisors is an integer number (84320030835).

Almost surely, 2^168640061669 is an apocalyptic number.

It is an amenable number.

168640061669 is a deficient number, since it is larger than the sum of its proper divisors (1).

168640061669 is an equidigital number, since it uses as much as digits as its factorization.

168640061669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2239488, while the sum is 53.

The spelling of 168640061669 in words is "one hundred sixty-eight billion, six hundred forty million, sixty-one thousand, six hundred sixty-nine".