168667609 has 16 divisors (see below), whose sum is σ = 188280576. Its totient is φ = 149806800.

The previous prime is 168667531. The next prime is 168667619. The reversal of 168667609 is 906766861.

168667609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 168667609 - 2⁹ = 168667097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (168667619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95674 + ... + 97420.

It is an arithmetic number, because the mean of its divisors is an integer number (11767536).

Almost surely, 2^168667609 is an apocalyptic number.

It is an amenable number.

168667609 is a deficient number, since it is larger than the sum of its proper divisors (19612967).

168667609 is a wasteful number, since it uses less digits than its factorization.

168667609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1956.

The product of its (nonzero) digits is 653184, while the sum is 49.

The square root of 168667609 is about 12987.2094385207. The cubic root of 168667609 is about 552.5147750326.

The spelling of 168667609 in words is "one hundred sixty-eight million, six hundred sixty-seven thousand, six hundred nine".