168664169 has 4 divisors (see below), whose sum is σ = 168868944. Its totient is φ = 168459396.

The previous prime is 168664147. The next prime is 168664183. The reversal of 168664169 is 961466861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168664169 is a prime.

It is a super-2 number, since 2×168664169² = 56895203808921122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (168663169) 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 in 3 ways as a sum of consecutive naturals, for example, 101147 + ... + 102800.

It is an arithmetic number, because the mean of its divisors is an integer number (42217236).

Almost surely, 2^168664169 is an apocalyptic number.

It is an amenable number.

168664169 is a deficient number, since it is larger than the sum of its proper divisors (204775).

168664169 is an equidigital number, since it uses as much as digits as its factorization.

168664169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204774.

The product of its digits is 373248, while the sum is 47.

The square root of 168664169 is about 12987.0769998487. The cubic root of 168664169 is about 552.5110188011.

The spelling of 168664169 in words is "one hundred sixty-eight million, six hundred sixty-four thousand, one hundred sixty-nine".