163644497 has 4 divisors (see below), whose sum is σ = 163844160. Its totient is φ = 163444836.

The previous prime is 163644463. The next prime is 163644539. The reversal of 163644497 is 794446361.

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 not a de Polignac number, because 163644497 - 2¹² = 163640401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163644427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98597 + ... + 100242.

It is an arithmetic number, because the mean of its divisors is an integer number (40961040).

Almost surely, 2^163644497 is an apocalyptic number.

It is an amenable number.

163644497 is a deficient number, since it is larger than the sum of its proper divisors (199663).

163644497 is an equidigital number, since it uses as much as digits as its factorization.

163644497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199662.

The product of its digits is 435456, while the sum is 44.

The square root of 163644497 is about 12792.3608845279. The cubic root of 163644497 is about 546.9745695470.

The spelling of 163644497 in words is "one hundred sixty-three million, six hundred forty-four thousand, four hundred ninety-seven".