163680809 has 4 divisors (see below), whose sum is σ = 166455120. Its totient is φ = 160906500.

The previous prime is 163680779. The next prime is 163680817. The reversal of 163680809 is 908086361.

It is a happy number.

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-163680809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163680889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1387067 + ... + 1387184.

It is an arithmetic number, because the mean of its divisors is an integer number (41613780).

Almost surely, 2^163680809 is an apocalyptic number.

It is an amenable number.

163680809 is a deficient number, since it is larger than the sum of its proper divisors (2774311).

163680809 is an equidigital number, since it uses as much as digits as its factorization.

163680809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2774310.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 163680809 is about 12793.7800903408. The cubic root of 163680809 is about 547.0150236452.

The spelling of 163680809 in words is "one hundred sixty-three million, six hundred eighty thousand, eight hundred nine".