163575565 has 4 divisors (see below), whose sum is σ = 196290684. Its totient is φ = 130860448.

The previous prime is 163575539. The next prime is 163575571. The reversal of 163575565 is 565575361.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19527561 + 144048004 = 4419^2 + 12002^2 .

It is a cyclic number.

It is not a de Polignac number, because 163575565 - 2¹³ = 163567373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16357552 + ... + 16357561.

It is an arithmetic number, because the mean of its divisors is an integer number (49072671).

Almost surely, 2^163575565 is an apocalyptic number.

It is an amenable number.

163575565 is a deficient number, since it is larger than the sum of its proper divisors (32715119).

163575565 is an equidigital number, since it uses as much as digits as its factorization.

163575565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32715118.

The product of its digits is 472500, while the sum is 43.

The square root of 163575565 is about 12789.6663365390. Note that the first 3 decimals coincide. The cubic root of 163575565 is about 546.8977580298.

The spelling of 163575565 in words is "one hundred sixty-three million, five hundred seventy-five thousand, five hundred sixty-five".