168668209 has 2 divisors, whose sum is σ = 168668210. Its totient is φ = 168668208.

The previous prime is 168668183. The next prime is 168668243. The reversal of 168668209 is 902866861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160275600 + 8392609 = 12660^2 + 2897^2 .

It is a cyclic number.

It is not a de Polignac number, because 168668209 - 2²¹ = 166571057 is a prime.

It is not a weakly prime, because it can be changed into another prime (168668009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84334104 + 84334105.

It is an arithmetic number, because the mean of its divisors is an integer number (84334105).

Almost surely, 2^168668209 is an apocalyptic number.

It is an amenable number.

168668209 is a deficient number, since it is larger than the sum of its proper divisors (1).

168668209 is an equidigital number, since it uses as much as digits as its factorization.

168668209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 168668209 is about 12987.2325381507. The cubic root of 168668209 is about 552.5154301841.

The spelling of 168668209 in words is "one hundred sixty-eight million, six hundred sixty-eight thousand, two hundred nine".