168643693 has 2 divisors, whose sum is σ = 168643694. Its totient is φ = 168643692.

The previous prime is 168643679. The next prime is 168643789. The reversal of 168643693 is 396346861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85414564 + 83229129 = 9242^2 + 9123^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168643693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168643603) 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 as a sum of consecutive naturals, namely, 84321846 + 84321847.

It is an arithmetic number, because the mean of its divisors is an integer number (84321847).

Almost surely, 2^168643693 is an apocalyptic number.

It is an amenable number.

168643693 is a deficient number, since it is larger than the sum of its proper divisors (1).

168643693 is an equidigital number, since it uses as much as digits as its factorization.

168643693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 46.

The square root of 168643693 is about 12986.2886538071. The cubic root of 168643693 is about 552.4886594316.

The spelling of 168643693 in words is "one hundred sixty-eight million, six hundred forty-three thousand, six hundred ninety-three".