168536809 has 8 divisors (see below), whose sum is σ = 193235328. Its totient is φ = 143993760.

The previous prime is 168536807. The next prime is 168536833. The reversal of 168536809 is 908635861.

168536809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 168536809 - 2¹ = 168536807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168536803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36532 + ... + 40885.

It is an arithmetic number, because the mean of its divisors is an integer number (24154416).

Almost surely, 2^168536809 is an apocalyptic number.

It is an amenable number.

168536809 is a deficient number, since it is larger than the sum of its proper divisors (24698519).

168536809 is an equidigital number, since it uses as much as digits as its factorization.

168536809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77735.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 168536809 is about 12982.1727380281. The cubic root of 168536809 is about 552.3719149179.

The spelling of 168536809 in words is "one hundred sixty-eight million, five hundred thirty-six thousand, eight hundred nine".