161364565 has 16 divisors (see below), whose sum is σ = 197607600. Its totient is φ = 126472192.

The previous prime is 161364563. The next prime is 161364607. The reversal of 161364565 is 565463161.

It can be written as a sum of positive squares in 8 ways, for example, as 41396356 + 119968209 = 6434^2 + 10953^2 .

It is a cyclic number.

It is not a de Polignac number, because 161364565 - 2¹ = 161364563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161364563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48681 + ... + 51889.

It is an arithmetic number, because the mean of its divisors is an integer number (12350475).

Almost surely, 2^161364565 is an apocalyptic number.

It is an amenable number.

161364565 is a deficient number, since it is larger than the sum of its proper divisors (36243035).

161364565 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 9 representation: 161364565 = (366564511)₉.

161364565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3416.

The product of its digits is 64800, while the sum is 37.

The square root of 161364565 is about 12702.9352907114. The cubic root of 161364565 is about 544.4224895662.

The spelling of 161364565 in words is "one hundred sixty-one million, three hundred sixty-four thousand, five hundred sixty-five".