169664423 has 4 divisors (see below), whose sum is σ = 170199960. Its totient is φ = 169128888.

The previous prime is 169664401. The next prime is 169664431. The reversal of 169664423 is 324466961.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 169664423 - 2¹⁸ = 169402279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169664323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267293 + ... + 267926.

It is an arithmetic number, because the mean of its divisors is an integer number (42549990).

Almost surely, 2^169664423 is an apocalyptic number.

169664423 is a deficient number, since it is larger than the sum of its proper divisors (535537).

169664423 is an equidigital number, since it uses as much as digits as its factorization.

169664423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535536.

The product of its digits is 186624, while the sum is 41.

The square root of 169664423 is about 13025.5296629350. The cubic root of 169664423 is about 553.6010793144.

The spelling of 169664423 in words is "one hundred sixty-nine million, six hundred sixty-four thousand, four hundred twenty-three".