161650565 has 8 divisors (see below), whose sum is σ = 196876320. Its totient is φ = 127390032.

The previous prime is 161650561. The next prime is 161650607. The reversal of 161650565 is 565056161.

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

It is a cyclic number.

It is not a de Polignac number, because 161650565 - 2² = 161650561 is a prime.

It is a super-3 number, since 3×161650565³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161650561) 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, 240935 + ... + 241604.

It is an arithmetic number, because the mean of its divisors is an integer number (24609540).

Almost surely, 2^161650565 is an apocalyptic number.

It is an amenable number.

161650565 is a deficient number, since it is larger than the sum of its proper divisors (35225755).

161650565 is an equidigital number, since it uses as much as digits as its factorization.

161650565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482611.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 161650565 is about 12714.1875477751. The cubic root of 161650565 is about 544.7439416621.

The spelling of 161650565 in words is "one hundred sixty-one million, six hundred fifty thousand, five hundred sixty-five".