163445809 has 8 divisors (see below), whose sum is σ = 172454240. Its totient is φ = 154478016.

The previous prime is 163445749. The next prime is 163445813. The reversal of 163445809 is 908544361.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163445809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163445869) 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 7 ways as a sum of consecutive naturals, for example, 1707 + ... + 18160.

It is an arithmetic number, because the mean of its divisors is an integer number (21556780).

Almost surely, 2^163445809 is an apocalyptic number.

163445809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

163445809 is a deficient number, since it is larger than the sum of its proper divisors (9008431).

163445809 is a wasteful number, since it uses less digits than its factorization.

163445809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20319.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 163445809 is about 12784.5926411443. The cubic root of 163445809 is about 546.7531112471.

The spelling of 163445809 in words is "one hundred sixty-three million, four hundred forty-five thousand, eight hundred nine".