220165181 has 8 divisors (see below), whose sum is σ = 233916984. Its totient is φ = 206502400.

The previous prime is 220165171. The next prime is 220165201. The reversal of 220165181 is 181561022.

It can be written as a sum of positive squares in 4 ways, for example, as 76405081 + 143760100 = 8741^2 + 11990^2 .

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

It is not a de Polignac number, because 220165181 - 2²² = 215970877 is a prime.

It is a super-2 number, since 2×220165181² = 96945413849525522, which contains 22 as substring.

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 220165181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220165111) 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, 17120 + ... + 27081.

It is an arithmetic number, because the mean of its divisors is an integer number (29239623).

Almost surely, 2^220165181 is an apocalyptic number.

It is an amenable number.

220165181 is a deficient number, since it is larger than the sum of its proper divisors (13751803).

220165181 is a wasteful number, since it uses less digits than its factorization.

220165181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44511.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 220165181 is about 14837.9641797654. The cubic root of 220165181 is about 603.8321217060.

The spelling of 220165181 in words is "two hundred twenty million, one hundred sixty-five thousand, one hundred eighty-one".