165220563 has 8 divisors (see below), whose sum is σ = 220682176. Its totient is φ = 109953000.

The previous prime is 165220553. The next prime is 165220589. The reversal of 165220563 is 365022561.

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

It is a de Polignac number, because none of the positive numbers 2^k-165220563 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165220563.

It is not an unprimeable number, because it can be changed into a prime (165220553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46513 + ... + 49938.

It is an arithmetic number, because the mean of its divisors is an integer number (27585272).

Almost surely, 2^165220563 is an apocalyptic number.

165220563 is a deficient number, since it is larger than the sum of its proper divisors (55461613).

165220563 is an equidigital number, since it uses as much as digits as its factorization.

165220563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97025.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 165220563 is about 12853.8151145876. The cubic root of 165220563 is about 548.7249394346.

The spelling of 165220563 in words is "one hundred sixty-five million, two hundred twenty thousand, five hundred sixty-three".