165196565 has 8 divisors (see below), whose sum is σ = 209896920. Its totient is φ = 124383232.

The previous prime is 165196547. The next prime is 165196571. The reversal of 165196565 is 565691561.

165196565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 19704721 + 145491844 = 4439^2 + 12062^2 .

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 165196565 - 2⁶ = 165196501 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 971660 + ... + 971829.

It is an arithmetic number, because the mean of its divisors is an integer number (26237115).

Almost surely, 2^165196565 is an apocalyptic number.

It is an amenable number.

165196565 is a deficient number, since it is larger than the sum of its proper divisors (44700355).

165196565 is a wasteful number, since it uses less digits than its factorization.

165196565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1943511.

The product of its digits is 243000, while the sum is 44.

The square root of 165196565 is about 12852.8815835205. The cubic root of 165196565 is about 548.6983710332.

The spelling of 165196565 in words is "one hundred sixty-five million, one hundred ninety-six thousand, five hundred sixty-five".